Details of the Researcher

PHOTO

Masato Kagitani
Section
Graduate School of Science
Job title
Assistant Professor
Degree

  • 博士（理学）（東北大学）

  • 修士（理学）（東北大学）

Research Interests 2

  • spectroscopy

  • planetary

Research Areas 1

  • Natural sciences / Space and planetary science /

Papers 81

  1. Variations in Jupiter's extended sodium nebula over two decades

    Mizuki Yoneda, Fuminori Tsuchiya, Carl Schmidt, Jeff Morgenthaler, Masato Kagitani, Takeshi Sakanoi

    2025/03/18

    Publisher: Copernicus GmbH

    DOI： 10.5194/egusphere-egu25-14285 　

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    We have been performing ground-based observations of Jupiter's sodium nebula longer than two decades. The sodium atoms in the nebula originate in Io's volcanic gas. The nebula distributes over 1,000 Jupiter's radii, and its angular size is approximately 10 degrees. Therefore, ground-based observations of D-line emissions in the sodium nebula can be made with small optics. The observation results indicate that the sodium D-line brightness in the nebula varies with various timescales like day-to-day through year-to-year. While it is naturally expected that variations in the brightness of the nebula reflect that of volcanism on Io, it may be influenced by locations of active volcanic plumes on Io. Sometimes, variations of the nebula differ between the eastern and western sides of Jupiter.  Details on the variations of Jupiter's extended sodium nebula will be shown. Especially, a period in which Juno spacecraft has been orbiting Jupiter will be focused. 

  2. Variability of Io plasma torus before and during the Juno era

    Masato Kagitani, Mizuki Yoneda, Fuminori Tsuchiya

    2025/03/18

    Publisher: Copernicus GmbH

    DOI： 10.5194/egusphere-egu25-7558 　

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    Volcanic gases, primarily composed of SO2, SO, and S, originating from Io are ionized through interactions with magnetospheric plasma, forming a dense plasma region known as the Io plasma torus. Ion pickup serves as the most significant energy source for the plasma torus though, the spatial distribution of the pickup region and its temporal variability remain poorly understood. Measuring ion distributions with sufficient spatial resolution enables the derivation of ion temperatures and temperature anisotropy, being closely related to the influx of fresh pickup ions.Since 2014, we have carried out ground-based observations of sulfur ion emissions ([SII] 671.6 nm and 673.1 nm) from the Io plasma torus at the Haleakal Observatory in Hawaii, utilizing Tohoku 60-cm telescope. The telescope is equipped with a monochromatic imager and a coronagraph, enabling us to observe the distribution of singly charged sulfur ions with a spatial resolution as fine as 0.03 Jovian radii. This unique setup has allowed us to track changes in the torus structure with high spatial and temporal precision.Over the past six years, our observations revealed five significant peaks in [SII] brightness. For three of these events, we observed that the [SII] ribbon scale height began to increase shortly after the brightness peaks. This phenomenon likely indicates a rise in ion temperature, driven by volcanic outbursts on Io that introduce fresh ions into the torus. Such findings provide critical insights into the dynamic nature of the Io plasma torus and its response to volcanic activity.In this presentation, we will review past and ongoing remote sensing projects, present the latest observational results from our multi-year campaign, and discuss future plans for supporting upcoming space missions.

  3. Results from Hisaki and prospects for LAPYUTA observations of the Jupiter System

    Fuminori Tsuchiya, Go Murakami, Atsushi Yamazaki, Kazuo Yoshioka, Masato Kagitani, Tomoki Kimura, Chihiro Tao, Ryoichi Koga, Hajime Kita, Jun Kimura, Shuya Tan, Kei Masunaga, Shotaro Sakai, Mizuki Yoneda, Masaki Kuwabara, Shingo Kameda, Ichiro Yoshikawa

    2025/03/18

    Publisher: Copernicus GmbH

    DOI： 10.5194/egusphere-egu25-14544 　

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    Remote sensing with ultraviolet wavelength (UV) are one of powerful probes to uncover dynamic behaviors of the planetary environment. The Hisaki satellite was an earth orbiting extreme ultraviolet (EUV) spectroscope dedicated for observing solar system planets. Thanks to its long-term monitoring capability, Hisaki had carried out unprecedented continuous observation of Io plasma torus, Jovian aurora, and Mars and Venus upper atmospheres from 2013 to 2023. One of notable phenomena observed by Hisaki is significant enhancements of neutral gas from presumed activation of volcanic activity on Io. Hisaki revealed, for the first time, that not only the plasma source, but transport, heating, and loss processes of magnetospheric plasma were influenced by the variation in the neutral source input.After the end of the Hisaki mission, we have proposed the next UV space telescope, LAPYUTA (Life-environmentology, Astronomy, and PlanetarY Ultraviolet Telescope Assembly). One of goals of this mission is dynamics of our solar system planets and moons as the most quantifiable archetypes of extraterrestrial habitable environments in the universe. LAPYUTA will not only provide a UV monitoring platform like Hisaki but also have a high spatial resolution and high sensitivity to uncover stability of Io’s atmosphere, water plumes that gushes from the subsurface ocean of icy moons, and spatio-temporal aspects of Jupiter's giant UV aurora. Primary goal of the LAPYUTA mission other than the Jovian system includes atmospheric evolution of Venus and Mars, characterization of exoplanet atmosphere, galaxy formation, and time-domain astronomy.

  4. Mass Supply from Io to Jupiter’s Magnetosphere

    Lorenz Roth, Aljona Blöcker, Katherine de Kleer, David Goldstein, Emmanuel Lellouch, Joachim Saur, Carl Schmidt, Darrell F. Strobel, Chihiro Tao, Fuminori Tsuchiya, Vincent Dols, Hans Huybrighs, Alessandro Mura, Jamey R. Szalay, Sarah V. Badman, Imke de Pater, Anne-Cathrine Dott, Masato Kagitani, Lea Klaiber, Ryoichi Koga, Alfred S. McEwen, Zachariah Milby, Kurt D. Retherford, Stephan Schlegel, Nicolas Thomas, Wei-Ling Tseng, Audrey Vorburger

    Space Science Reviews　2025/02

    DOI： 10.1007/s11214-025-01137-x 　

  5. Major brightening events in Jupiter’s sodium nebula during Juno era

    M. Yoneda, F. Tsuchiya, C. Schmidt, M. Kagitani, T. Sakanoi

    Icarus　425　116301-116301　2025/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.icarus.2024.116301 　

    ISSN： 0019-1035

  6. Solar wind response of the dawn-dusk asymmetry in the Io plasma torus using the Haleakala T60 and HISAKI satellite observations

    Hiroyasu Kondo, Fuminori Tsuchiya, Masato Kagitani, Shinnosuke Satoh, Hiroaki Misawa, Yuki Nakamura, Go Murakami, Tomoki Kimura, Atsushi Yamazaki, Ichiro Yoshikawa, Hajime Kita, Chihiro Tao

    2024/05/28

    DOI： 10.22541/essoar.171692989.93103153/v1 　

  7. The first simultaneous spectroscopic and monochromatic imaging observations of short-wavelength infrared aurora of N2+ Meinel (0,0) band at 1.1 μm with incoherent scatter radar Peer-reviewed

    T. Nishiyama, M. Kagitani, S. Furutachi, Y. Iwasa, Y. Ogawa, T. T. Tsuda, P. Dalin, F. Tsuchiya, S. Nozawa, F. Sigernes

    Earth Planets Space　76　30　2024/02

    DOI： 10.1186/s40623-024-01969-x 　

  8. Simulation of Dawn‐To‐Dusk Electric Field in the Jovian Inner Magnetosphere via Region 2‐Like Field‐Aligned Current Peer-reviewed

    Yuki Nakamura, Koichiro Terada, Chihiro Tao, Naoki Terada, Yasumasa Kasaba, François Leblanc, Hajime Kita, Aoi Nakamizo, Akimasa Yoshikawa, Shinichi Ohtani, Fuminori Tsuchiya, Masato Kagitani, Takeshi Sakanoi, Go Murakami, Kazuo Yoshioka, Tomoki Kimura, Atsushi Yamazaki, Ichiro Yoshikawa

    Journal of Geophysical Research: Space Physics　128　(6)　2023/06/16

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2022ja031248 　

    ISSN： 2169-9380

    eISSN： 2169-9402

  9. Comparative study of optical designs of ultraviolet spectrometers onboard spaceborne telescopes

    Keigo Enya, Masato Kagitani, Fuminori Tsuchiyac, Go Murakami, Atsushi Yamazakia, Kazuo Yoshioka

    SPIE Future Sensing Technologies 2023　2023/05/22

    Publisher: SPIE

    DOI： 10.1117/12.2647120 　

  10. Major results from the Hisaki mission and future perspectives

    Fuminori Tsuchiya, Yasumasa Kasaba, Ichiro Yoshikawa, Go Murakami, Atsushi Yamazaki, Kazuo Yoshioka, Tomoki Kimura, Chihiro Tao, Ryoichi Koga, Hajime Kita, Kei Masunaga, Masato Kagitani, Shotaro Sakai, Masaki Kuwabara

    2023/02/22

    Publisher: Copernicus GmbH

    DOI： 10.5194/egusphere-egu23-4751 　

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    Hisaki is an earth orbiting extreme ultraviolet spectroscope dedicated for observing solar system planets. Thanks to its monitoring capability, Hisaki has carried out unprecedented continuous observation of Io plasma torus, Jovian aurora, and Mars and Venus upper atmosphere since December 2013. One of notable phenomena observed by Hisaki is significant enhancements of neutral gas (sodium and oxygen) from Io occurred in the spring of 2015. Hisaki revealed that not only the plasma source, but transport, heating, and loss processes of magnetospheric plasma were influenced by the variation in the neutral source input. The presentation will include related topics from recent Hisaki publication. Since the autumn of 2016, the Juno spacecraft was in the orbit around Jupiter. Hisaki monitored activities of Jovian aurora and the plasma torus in the Juno era. These datasets will provide opportunities to compare in-situ observation by Juno with the global view by Hisaki. JAXA approved the Hisaki mission period by the end of March 2023. As a future remote observation platform, we are going to propose a UV space telescope, LAPYUTA (Life-environmentology, Astronomy, and PlanetarY Ultraviolet Telescope Assembly), a Japanese-leading mission using heritages of UV instruments for planetary science (e.g., Hisaki) and space telescope techniques for astronomy. One of goals of this mission is dynamics of our solar system planets and moons as the most quantifiable archetypes of extraterrestrial habitable environments in the universe. Water plume that gushes from the subsurface ocean of Galilean moons and tenuous atmosphere which is generated by bombardment of energetic charged particles to the surface are primary targets of LAPYUTA. As the plume activity and the atmosphere are not stable, continuous monitoring with high spatial resolution is essential. The icy moon's plume and ambient space will be deeply explored with the spacecraft by NASA's and ESA's icy moon missions in 2020s-2030s. The complementary remote sensing by LAPYUTA will visualize their global structure and temporal dynamics.

  11. High-precision broadband linear polarimetry of early-type binaries: III. AO Cassiopeiae revisited

    Yasir Abdul Qadir, Andrei V. Berdyugin, Vilppu Piirola, Takeshi Sakanoi, Masato Kagitani

    Astronomy and Astrophysics　670　2023/02/01

    DOI： 10.1051/0004-6361/202245452 　

    ISSN： 0004-6361

    eISSN： 1432-0746

  12. High-precision broadband linear polarimetry of early-type binaries

    Yasir Abdul Qadir, Andrei V. Berdyugin, Vilppu Piirola, Takeshi Sakanoi, Masato Kagitani

    ASTRONOMY & ASTROPHYSICS　670　2023/02

    DOI： 10.1051/0004-6361/202245452 　

    ISSN： 0004-6361

    eISSN： 1432-0746

  13. X-Ray Polarization Observations of BL Lacertae

    Riccardo Middei, Ioannis Liodakis, Matteo Perri, Simonetta Puccetti, Elisabetta Cavazzuti, Laura Di Gesu, Steven R. Ehlert, Grzegorz Madejski, Alan P. Marscher, Herman L. Marshall, Fabio Muleri, Michela Negro, Svetlana G. Jorstad, Beatriz Agis-Gonzalez, Ivan Agudo, Giacomo Bonnoli, Maria Bernardos, Victor Casanova, Maya Garcia-Comas, Cesar Husillos, Alessandro Marchini, Alfredo Sota, Pouya M. Kouch, Elina Lindfors, George A. Borman, Evgenia N. Kopatskaya, Elena G. Larionova, Daria A. Morozova, Sergey S. Savchenko, Andrey A. Vasilyev, Alexey Zhovtan, Carolina Casadio, Juan Escudero, Ioannis Myserlis, Antonio Hales, Seiji Kameno, Ruediger Kneissl, Hugo Messias, Hiroshi Nagai, Dmitry Blinov, Ioakeim G. Bourbah, Sebastian Kiehlmann, Evangelos Kontopodis, Nikos Mandarakas, Stylianos Romanopoulos, Raphael Skalidis, Anna Vervelaki, Joseph R. Masiero, Dimitri Mawet, Maxwell A. Millar-Blanchaer, Georgia Panopoulou, Samaporn Tinyanont, Andrei Berdyugin, Masato Kagitani, Vadim Kravtsov, Takeshi Sakanoi, Ryo Imazawa, Mahito Sasada, Yasushi Fukazawa, Koji S. Kawabata, Makoto Uemura, Tsunefumi Mizuno, Tatsuya Nakaoka, Hiroshi Akitaya, Mark Gurwell, Ramprasad Rao, Niccolo Di Lalla, Nicolo Cibrario, Immacolata Donnarumma, Dawoon E. Kim, Nicola Omodei, Luigi Pacciani, Juri Poutanen, Fabrizio Tavecchio, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Fiamma Capitanio, Simone Castellano, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Alessandro Di Marco, Victor Doroshenko, Michal Dovciak, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Riccardo Ferrazzoli, Javier A. Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Vladimir Karas, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Simone Maldera, Alberto Manfreda, Frederic Marin, Andrea Marinucci, Francesco Massaro, Giorgio Matt, Ikuyuki Mitsuishi, C-Y Ng, Stephen L. O'Dell, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Maura Pilia, Andrea Possenti, Brian D. Ramsey, John Rankin, Ajay Ratheesh, Roger W. Romani, Carmelo Sgro, Patrick Slane, Paolo Soffitta, Gloria Spandre, Toru Tamagawa, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey Tsygankov, Roberto Turolla, Jacco Vink, Martin C. Weisskopf, Kinwah Wu, Fei Xie, Silvia Zane

    ASTROPHYSICAL JOURNAL LETTERS　942　(1)　2023/01

    DOI： 10.3847/2041-8213/aca281 　

    ISSN： 2041-8205

    eISSN： 2041-8213

  14. Polarized x-rays constrain the disk-jet geometry in the black hole x-ray binary Cygnus X-1

    Henric Krawczynski, Fabio Muleri, Michal Dovciak, Alexandra Veledina, Nicole Rodriguez Cavero, Jiri Svoboda, Adam Ingram, Giorgio Matt, Javier A. Garcia, Vladislav Loktev, Michela Negro, Juri Poutanen, Takao Kitaguchi, Jakub Podgorny, John Rankin, Wenda Zhang, Andrei Berdyugin, Svetlana Berdyugina, Stefano Bianchi, Dmitry Blinov, Fiamma Capitanio, Niccolo Di Lalla, Paul Draghis, Sergio Fabiani, Masato Kagitani, Vadim Kravtsov, Sebastian Kiehlmann, Luca Latronico, Alexander A. Lutovinov, Nikos Mandarakas, Frederic Marin, Andrea Marinucci, Jon Miller, Tsunefumi Mizuno, Sergey Molkov, Nicola Omodei, Pierre-Olivier Petrucci, Ajay Ratheesh, Takeshi Sakanoi, Andrei N. Semena, Raphael Skalidis, Paolo Soffitta, Allyn F. Tennant, Phillipp Thalhammer, Francesco Tombesi, Martin C. Weisskopf, Joern Wilms, Sixuan Zhang, Ivan Agudo, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Simone Castellano, Elisabetta Cavazzuti, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Alessandro Di Marco, Immacolata Donnarumma, Victor Doroshenko, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Riccardo Ferrazzoli, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Svetlana G. Jorstad, Vladimir Karas, Jeffery J. Kolodziejczak, Fabio La Monaca, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Alan P. Marscher, Herman L. Marshall, Francesco Massaro, Ikuyuki Mitsuishi, Chi-Yung Ng, Stephen L. O'Dell, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Melissa Pesce-Rollins, Maura Pilia, Andrea Possenti, Simonetta Puccetti, Brian D. Ramsey, Roger W. Romani, Carmelo Sgro, Patrick Slane, Gloria Spandre, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Nicholas E. Thomas, Alessio Trois, Sergey Tsygankov, Roberto Turolla, Jacco Vink, Kinwah Wu, Fei Xie, Silvia Zane

    SCIENCE　378　(6620)　650-654　2022/11

    DOI： 10.1126/science.add5399 　

    ISSN： 0036-8075

    eISSN： 1095-9203

  15. Optical polarization signatures of black hole X-ray binaries

    Vadim Kravtsov, Andrei V. Berdyugin, Ilia A. Kosenkov, Alexandra Veledina, Vilppu Piirola, Yasir Abdul Qadir, Svetlana V. Berdyugina, Takeshi Sakanoi, Masato Kagitani, Juri Poutanen

    Monthly Notices of the Royal Astronomical Society　514　(2)　2479-2487　2022/08/01

    DOI： 10.1093/mnras/stac1470 　

    ISSN： 0035-8711

    eISSN： 1365-2966

  16. Polarimetry of M-type asteroids in the context of their surface composition

    I. Belskaya, A. Berdyugin, Yu Krugly, Z. Donchev, A. Sergeyev, R. Gil-Hutton, S. Mykhailova, T. Bonev, V. Piirola, S. Berdyugina, M. Kagitani, T. Sakanoi

    Astronomy and Astrophysics　663　2022/07/01

    DOI： 10.1051/0004-6361/202142784 　

    ISSN： 0004-6361

    eISSN： 1432-0746

  17. Optical polarization signatures of black hole X-ray binaries

    Vadim Kravtsov, Andrei Berdyugin, Ilia A. Kosenkov, Alexandra Veledina, Vilppu Piirola, Yasir Abdul Qadir, Svetlana Berdyugina, Takeshi Sakanoi, Masato Kagitani, Juri Poutanen

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　514　(2)　2479-2487　2022/06

    DOI： 10.1093/mnras/stac1470 　

    ISSN： 0035-8711

    eISSN： 1365-2966

  18. Effect of Meteoric Ions on Ionospheric Conductance at Jupiter

    Yuki Nakamura, Koichiro Terada, Chihiro Tao, Naoki Terada, Yasumasa Kasaba, François Leblanc, Hajime Kita, Aoi Nakamizo, Akimasa Yoshikawa, Shinichi Ohtani, Fuminori Tsuchiya, Masato Kagitani, Takeshi Sakanoi, Go Murakami, Kazuo Yoshioka, Tomoki Kimura, Atsushi Yamazaki, Ichiro Yoshikawa

    Journal of Geophysical Research: Space Physics　127　(3)　2022/03

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2022ja030312 　

    ISSN： 2169-9380

    eISSN： 2169-9402

  19. A coronagraph using a digital micromirror device as an adaptive occultation mask: design and observational result

    Masato Kagitani, Takeshi Sakanoi, Yasumasa Kasaba, Shoichi Okano

    Ground-based and Airborne Instrumentation for Astronomy VIII　2020/12/13

    Publisher: SPIE

    DOI： 10.1117/12.2561906 　

  20. High dynamic-range observation using a 1.8-m off-axis telescope PLANETS: feasibility study and telescope design

    Masato Kagitani, Takeshi Sakanoi, Yasumasa Kasaba, Yasuhiro Hirahara, Mikio Kurita, Jeffrey R. Kuhn, Svetlana V. Berdyugina, Marcelo Emilio

    Ground-based and Airborne Telescopes VIII　2020/12/13

    Publisher: SPIE

    DOI： 10.1117/12.2556458 　

  21. Orbital variability of the optical linear polarization of the γ -ray binary LS i +61° 303 and new constraints on the orbital parameters

    Vadim Kravtsov, Andrei V. Berdyugin, Vilppu Piirola, Ilia A. Kosenkov, Sergey S. Tsygankov, Maria Chernyakova, Denys Malyshev, Takeshi Sakanoi, Masato Kagitani, Svetlana V. Berdyugina, Juri Poutanen

    Astronomy and Astrophysics　643　2020/11/01

    DOI： 10.1051/0004-6361/202038745 　

    ISSN： 0004-6361

    eISSN： 1432-0746

  22. Evidence for a rapid decrease of Pluto's atmospheric pressure revealed by a stellar occultation in 2019 Peer-reviewed

    K. Arimatsu, G. L. Hashimoto, M. Kagitani, T. Sakanoi, Y. Kasaba, R. Ohsawa, S. Urakawa

    Astronomy and Astrophysics　638　2020/06/01

    DOI： 10.1051/0004-6361/202037762 　

    ISSN： 0004-6361

    eISSN： 1432-0746

  23. Disc and wind in black hole X-ray binary MAXI J1820+070 observed through polarized light during its 2018 outburst

    Ilia A. Kosenkov, Alexandra Veledina, Andrei V. Berdyugin, Vadim Kravtsov, Vilppu Piirola, Svetlana V. Berdyugina, Takeshi Sakanoi, Masato Kagitani, Juri Poutanen

    Monthly Notices of the Royal Astronomical Society: Letters　496　(1)　L96-L100　2020/05/22

    DOI： 10.1093/mnrasl/slaa096 　

    ISSN： 1745-3925

    eISSN： 1745-3933

  24. Spatially asymmetric increase in hot electron fraction in the Io plasma torus during volcanically active period observed by Hisaki/EXCEED International-coauthorship Peer-reviewed

    Hikida, R, K. Yoshioka, F. Tsuchiya, M. Kagitani, T. Kimura, F. Bagenal, N. Schneider, G. Murakami, A. Yamazaki, H. Kita, I. Yoshikawa

    Journal of Geophysical Research: Space Physics　125　(3)　2019/12

    DOI： 10.1029/2019JA027100 　

    ISSN： 2169-9380

    eISSN： 2169-9402

  25. Azimuthal Variation in the Io Plasma Torus Observed by the Hisaki Satellite From 2013 to 2016 Peer-reviewed

    F. Tsuchiya, R. Arakawa, H. Misawa, M. Kagitani, R. Koga, F. Suzuki, R. Hikida, K. Yoshioka, A. Steffl, F. Bagenal, P. Delamere, T. Kimura, Y. Kasaba, G. Murakami, I. Yoshikawa, A. Yamazaki, M. Yoneda

    Journal of Geophysical Research: Space Physics　124　(5)　3236-3254　2019/05

    DOI： 10.1029/2018JA026038 　

    ISSN： 2169-9380

    eISSN： 2169-9402

  26. Planetary atmospheric monitoring with the Tohoku University Haleakala telescopes: current status and future plan

    Sakanoi, T, M. Kagitani, H. Nakagawa, Y. Hirahara, M. Akiyama, T. MIyata, Y. Kasaba, S. Okano

    Proceedings of Symposium on Planetary Science 2019　2019

  27. Pulsation Characteristics of Jovian Infrared Northern Aurora Observed by the Subaru IRCS with Adaptive Optics Peer-reviewed

    H. Watanabe, H. Kita, C. Tao, M. Kagitani, T. Sakanoi, Y. Kasaba

    Geophysical Research Letters　45　(21)　11,547-11,554　2018/11/16

    DOI： 10.1029/2018GL079411 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  28. The influence of Io's 2015 volcanic activity on Jupiter's magnetospheric dynamics Peer-reviewed

    Yoshioka, K, F. Tsuchiya, M. Kagitani, T. Kimura, G. Murakami, D. Fukuyama, A. Yamazaki, I. Yoshikawa, M. Fujimoto

    Geophysical Research Letters　45　(19)　10,193-10,199　2018/11/01

    DOI： 10.1029/2018GL079264 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  29. Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using Its General Relativity Centenary Flare: Improved Orbital Parameters Peer-reviewed

    Lankeswar Dey, M. J. Valtonen, A. Gopakumar, S. Zola, R. Hudec, P. Pihajoki, S. Ciprini, K. Matsumoto, K. Sadakane, M. Kidger, K. Nilsson, S. Mikkola, A. Sillanpää, L. O. Takalo, H. J. Lehto, A. Berdyugin, V. Piirola, H. Jermak, K. S. Baliyan, T. Pursimo, D. B. Caton, F. Alicavus, A. Baransky, P. Blay, P. Boumis, D. Boyd, M. Campas Torrent, F. Campos, J. Carrillo Gómez, S. Chandra, V. Chavushyan, J. Dalessio, B. Debski, M. Drozdz, H. Er, A. Erdem, A. Escartin Pérez, V. Fallah Ramazani, A. V. Filippenko, E. Gafton, S. Ganesh, F. Garcia, K. Gazeas, V. Godunova, F. Gómez Pinilla, M. Gopinathan, J. B. Haislip, J. Harmanen, G. Hurst, J. Janík, M. Jelinek, A. Joshi, M. Kagitani, R. Karjalainen, N. Kaur, W. C. Keel, V. V. Kouprianov, T. Kundera, S. Kurowski, A. Kvammen, A. P. Lacluyze, B. C. Lee, A. Liakos, E. Lindfors, J. Lozano De Haro, M. Mugrauer, R. Naves Nogues, A. W. Neely, R. H. Nelson, W. Ogloza, S. Okano, U. Pajdosz-Śmierciak, J. C. Pandey, M. Perri, G. Poyner, J. Provencal, A. Raj, D. E. Reichart, R. Reinthal, T. Reynolds, J. Saario, S. Sadegi, T. Sakanoi, J. L.Salto González, Sameer, T. Schweyer, A. Simon, M. Siwak, F. C.Soldán Alfaro, E. Sonbas, I. Steele, J. T. Stocke, J. Strobl, T. Tomov, L. Tremosa Espasa, J. R. Valdes, J. Valero Pérez, F. Verrecchia, V. Vasylenko, J. R. Webb

    Astrophysical Journal　866　(1)　11　2018/10/10

    DOI： 10.3847/1538-4357/aadd95 　

    ISSN： 0004-637X

    eISSN： 1538-4357

  30. Stochastic Modeling of Multiwavelength Variability of the Classical BL Lac Object OJ 287 on Timescales Ranging from Decades to Hours Peer-reviewed

    A. Goyal, Stawarz, S. Zola, V. Marchenko, M. Soida, K. Nilsson, S. Ciprini, A. Baran, M. Ostrowski, P. J. Wiita, Gopal-Krishna, A. Siemiginowska, M. Sobolewska, S. Jorstad, A. Marscher, M. F. Aller, H. D. Aller, T. Hovatta, D. B. Caton, D. Reichart, K. Matsumoto, K. Sadakane, K. Gazeas, M. Kidger, V. Piirola, H. Jermak, F. Alicavus, K. S. Baliyan, A. Baransky, A. Berdyugin, P. Blay, P. Boumis, D. Boyd, Y. Bufan, M. Campas Torrent, F. Campos, J. Carrillo Gómez, J. Dalessio, B. Debski, D. Dimitrov, M. Drozdz, H. Er, A. Erdem, A. Escartin Pérez, V. Fallah Ramazani, A. V. Filippenko, E. Gafton, F. Garcia, V. Godunova, F. Gómez Pinilla, M. Gopinathan, J. B. Haislip, S. Haque, J. Harmanen, R. Hudec, G. Hurst, K. M. Ivarsen, A. Joshi, M. Kagitani, N. Karaman, R. Karjalainen, N. Kaur, D. Kozieł-Wierzbowska, E. Kuligowska, T. Kundera, S. Kurowski, A. Kvammen, A. P. Lacluyze, B. C. Lee, A. Liakos, J. Lozano De Haro, J. P. Moore, M. Mugrauer, R. Naves Nogues, A. W. Neely, W. Ogloza, S. Okano, U. Pajdosz, J. C. Pandey, M. Perri, G. Poyner, J. Provencal, T. Pursimo, A. Raj, B. Rajkumar, R. Reinthal, T. Reynolds, J. Saario, S. Sadegi, T. Sakanoi, J. L.Salto González, Sameer, A. O. Simon, M. Siwak, T. Schweyer, F. C.Soldán Alfaro, E. Sonbas, J. Strobl, L. O. Takalo, L. Tremosa Espasa

    Astrophysical Journal　863　(2)　175　2018/08/20

    DOI： 10.3847/1538-4357/aad2de 　

    ISSN： 0004-637X

    eISSN： 1538-4357

  31. Enhancement of the Jovian Magnetospheric Plasma Circulation Caused by the Change in Plasma Supply From the Satellite Io Peer-reviewed

    F. Tsuchiya, K. Yoshioka, T. Kimura, R. Koga, G. Murakami, A. Yamazaki, M. Kagitani, C. Tao, F. Suzuki, R. Hikida, I. Yoshikawa, Y. Kasaba, H. Kita, H. Misawa, T. Sakanoi

    Journal of Geophysical Research: Space Physics　123　(8)　6514-6532　2018/08

    DOI： 10.1029/2018JA025316 　

    ISSN： 2169-9380

    eISSN： 2169-9402

  32. Development of PLANETS telescope and visible-infrared spectrometer for monitoring of planetary and exoplanetary atmospheres Peer-reviewed

    Sakanoi T, Kuhn J, Berdyugina S, Emilio M, Kagitani M, Hirahara Y, Nakagawa H, Kasaba Y, Obara T, Okano S, Scholl I, Berdyugin A, Piirola V

    Proceedings of SPIE - The International Society for Optical Engineering: Ground-based and Airborne Telescopes VII　10700　107004J　2018/07

    DOI： 10.1117/12.2312363 　

    ISSN： 0277-786X

    eISSN： 1996-756X

  33. Spatial Distribution of Io's Neutral Oxygen Cloud Observed by Hisaki Peer-reviewed

    Ryoichi Koga, Fuminori Tsuchiya, Masato Kagitani, Takeshi Sakanoi, Mizuki Yoneda, Kazuo Yoshioka, Ichiro Yoshikawa, Tomoki Kimura, Go Murakami, Atsushi Yamazaki, H. Todd Smith, Fran Bagenal

    Journal of Geophysical Research: Space Physics　123　(5)　3764-3776　2018/05

    DOI： 10.1029/2018JA025328 　

    ISSN： 2169-9380

    eISSN： 2169-9402

  34. High-precision broad-band linear polarimetry of early-type binaries: II. Variable, phase-locked polarization in triple Algol-type system λ Tauri Peer-reviewed

    A. Berdyugin, V. Piirola, T. Sakanoi, M. Kagitani, M. Yoneda

    Astronomy and Astrophysics　611　(A69)　2018/03/01

    DOI： 10.1051/0004-6361/201732163 　

    ISSN： 0004-6361

    eISSN： 1432-0746

  35. Study of the Solar Wind Influence on the Jovian Inner Magnetosphere Using an Ionospheric Potential Solver Peer-reviewed

    Terada K, Tao C, Terada N, Kasaba Y, Kita H, Nakamizo A, Yoshikawa A, Ohtani S, Tsuchiya F, Kagitani M

    Lunar and Planetary Science Conference　49　2018

  36. Haleakala telescopes: ハレアカラ望遠鏡と将来PLANETS望遠鏡による惑星大気・系外惑星研究の新展開

    坂野井 健, 鍵谷将人, 中川広務, 小原隆博, 笠羽康正, 平原靖大, 山田学, 岡野章一, 秋山正幸, Jeff Kuhn, Svetalana Berdyugina, Marcelo Emiliob, Gill Moretto

    Proceedings of Symposium on Planetary Science 2018　2018

  37. Survey of period variations of superhumps in SU UMa-type dwarf novae. IX. The ninth year (2016-2017) Peer-reviewed

    Taichi Kato, Keisuke Isogai, Franz-Josef Hambsch, Tonny Vanmunster, Hiroshi Itoh, Berto Monard, Tamas Tordai, Mariko Kimura, Yasuyuki Wakamatsu, Seiichiro Kiyota, Ian Miller, Peter Starr, Kiyoshi Kasai, Sergey Yu. Shugarov, Drahomir Chochol, Natalia Katysheva, Anna M. Zaostrojnykh, Matej Sekeras, Yuliana G. Kuznyetsova, Eugenia S. Kalinicheva, Polina Golysheva, Viktoriia Krushevska, Yutaka Maeda, Pavol A. Dubovsky, Igor Kudzej, Elena P. Pavlenko, Kirill A. Antonyuk, Nikolaj V. Pit, Aleksei A. Sosnovskij, Oksana I. Antonyuk, Aleksei V. Baklanov, Roger D. Pickard, Naoto Kojiguchi, Yuki Sugiura, Shihei Tei, Kenta Yamamura, Katsura Matsumoto, Javier Ruiz, Geoff Stone, Lewis M. Cook, Enrique de Miguel, Hidehiko Akazawa, William N. Goff, Etienne Morelle, Stella Kafka, Colin Littlefield, Greg Bolt, Franky Dubois, Stephen M. Brincat, Hiroyuki Maehara, Takeshi Sakanoi, Masato Kagitani, Akira Imada, Irina B. Voloshina, Maksim V. Andreev, Richard Sabo, Michael Richmond, Tony Rodda, Peter Nelson, Sergey Nazarov, Nikolay Mishevskiy, Gordon Myers, Denis Denisenko, Krzysztof Z. Stanek, Joseph V. Shields, Christopher S. Kochanek, Thomas W. -S. Holoien, Benjamin Shappee, Jose L. Prieto, Koh-ichi Itagaki, Koichi Nishiyama, Fujio Kabashima, Rod Stubbings, Patrick Schmeer, Eddy Muyllaert, Tsuneo Horie, Jeremy Shears, Gary Poyner, Masayuki Moriyama

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　69　(5)　2017/10

    DOI： 10.1093/pasj/psx058 　

    ISSN： 0004-6264

    eISSN： 2053-051X

  38. Current status of Haleakala Observatory, Instrumentation and its future perspective

    Sakanoi, T, M. Kagitani, T. Obara, Y. Yoneda, S. Okano, H. Nakagawa, Y. Kasaba

    Proceedings of Symposium on Planetary Science 2017　2017

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  39. Response of Jupiter's inner magnetosphere to the solar wind derived from extreme ultraviolet monitoring of the Io plasma torus

    Go Murakami, Kazuo Yoshioka, Atsushi Yamazaki, Fuminori Tsuchiya, Tomoki Kimura, Chihiro Tao, Hajime Kita, Masato Kagitani, Takeshi Sakanoi, Kazunori Uemizu, Yasumasa Kasaba, Ichiro Yoshikawa, Masaki Fujimoto

    Geophysical Research Letters　43　(24)　12-316　2016/12/28

    Publisher: Blackwell Publishing Ltd

    DOI： 10.1002/2016GL071675 　

    ISSN： 1944-8007 0094-8276

  40. High-precision broad-band linear polarimetry of early-type binaries I. Discovery of variable, phase-locked polarization in HD48099 Peer-reviewed

    A. Berdyugin, V. Piirola, S. Sadegi, S. Tsygankov, T. Sakanoi, M. Kagitani, M. Yoneda, S. Okano, J. Poutanen

    ASTRONOMY & ASTROPHYSICS　591　A92　2016/07

    DOI： 10.1051/0004-6361/201528020 　

    ISSN： 1432-0746

  41. PRIMARY BLACK HOLE SPIN IN OJ 287 AS DETERMINED BY THE GENERAL RELATIVITY CENTENARY FLARE Peer-reviewed

    M. J. Valtonen, S. Zola, S. Ciprini, A. Gopakumar, K. Matsumoto, K. Sadakane, M. Kidger, K. Gazeas, K. Nilsson, A. Berdyugin, V. Piirola, H. Jermak, K. S. Baliyan, F. Alicavus, D. Boyd, M. Campas Torrent, F. Campos, J. Carrillo Gomez, D. B. Caton, V. Chavushyan, J. Dalessio, B. Debski, D. Dimitrov, M. Drozdz, H. Er, A. Erdem, A. Escartin Perez, V. Fallah Ramazani, A. V. Filippenko, S. Ganesh, F. Garcia, F. Gomez Pinilla, M. Gopinathan, J. B. Haislip, R. Hudec, G. Hurst, K. M. Ivarsen, M. Jelinek, A. Joshi, M. Kagitani, N. Kaur, W. C. Keel, A. P. LaCluyze, B. C. Lee, E. Lindfors, J. Lozano de Haro, J. P. Moore, M. Mugrauer, R. Naves Nogues, A. W. Neely, R. H. Nelson, W. Ogloza, S. Okano, J. C. Pandey, M. Perri, P. Pihajoki, G. Poyner, J. Provencal, T. Pursimo, A. Raj, D. E. Reichart, R. Reinthal, S. Sadegi, T. Sakanoi, J. -L. Salto Gonzalez, Sameer, T. Schweyer, M. Siwak, F. C. Soldan Alfaro, E. Sonbas, I. Steele, J. T. Stocke, J. Strobl, L. O. Takalo, T. Tomov, L. Tremosa Espasa, J. R. Valdes, J. Valero Perez, F. Verrecchia, J. R. Webb, M. Yoneda, M. Zejmo, W. Zheng, J. Telting, J. Saario, T. Reynolds, A. Kvammen, E. Gafton, R. Karjalainen, J. Harmanen, P. Blay

    ASTROPHYSICAL JOURNAL LETTERS　819　(2)　L37　2016/03

    DOI： 10.3847/2041-8205/819/2/L37 　

    ISSN： 2041-8205

    eISSN： 2041-8213

  42. A search for QPOs in the blazar OJ287: Preliminary results from the 2015/2016 observing campaign Peer-reviewed

    Zola, S., Valtonen, M., Bhatta, G., Goyal, A., Debski, B., Baran, A., Krzesinski, J., Siwak, M., Ciprini, S., Gopakumar, A., Jermak, H., Nilsson, K., Reichart, D., Matsumoto, K., Sadakane, K., Gazeas, K., Kidger, M., Piirola, V., Alicavus, F., Baliyan, K.S., Berdyugin, A., Boyd, D., Campas Torrent, M., Campos, F., Carrillo Gómez, J., Caton, D.B., Chavushyan, V., Dalessio, J., Dimitrov, D., Drozdz, M., Er, H., Erdem, A., Escartin Pérez, A., Fallah Ramazani, V., Filippenko, A.V., Garcia, F., Gómez Pinilla, F., Gopinathan, M., Haislip, J.B., Harmanen, J., Hudec, R., Hurst, G., Ivarsen, K.M., Jelinek, M., Joshi, A., Kagitani, M., Kaur, N., Keel, W.C., LaCluyze, A.P., Lee, B.C., Lindfors, E., Lozano de Haro, J., Moore, J.P., Mugrauer, M., Naves Nogues, R., Neely, A.W., Nelson, R.H., Ogloza, W., Okano, S., Pandey, J.C., Perri, M., Pihajoki, P., Poyner, G., Provencal, J., Pursimo, T., Raj, A., Reinthal, R., Sadegi, S., Sakanoi, T., Sameer, González, J.-L.S., Schweyer, T., Soldán Alfaro, F.C., Karaman, N., Sonbas, E., Steele, I., Stocke, J.T., Strobl, J., Takalo, L.O., Tomov, T., Tremosa Espasa, L., Valdes, J.R., Valero Pérez, J., Verrecchia, F., Webb, J.R., Yoneda, M., Zejmo, M., Zheng, W., Telting, J., Saario, J., Reynolds, T., Kvammen, A., Gafton, E., Karjalainen, R., Blay, P.

    Galaxies　4　(4)　41　2016

    DOI： 10.3390/galaxies4040041 　

  43. ひさき衛星によるイオ周辺の130.4nm酸素原子発光の時間変動解析

    2016

  44. Summary of JSPS program on international collaboration for planetary plasma and atmospheric dynamics research based on Hawaiian planetary telescopes

    Sakanoi, T, M. Kagitani, H. Nakagawa, N. Terada, T. Kuroda, Y. Kasaba, T. Obara, H. Misawa, F. Tsuchiya

    Proceedings of Symposium on Planetary Science 2016　2016

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  45. Periodic variations of oxygen EUV dayglow in the upper atmosphere of Venus: Hisaki/EXCEED observations Peer-reviewed

    K. Masunaga, K. Seki, N. Terada, F. Tsuchiya, T. Kimura, K. Yoshioka, G. Murakami, A. Yamazaki, M. Kagitani, C. Tao, A. Fedorov, Y. Futaana, T. L. Zhang, D. Shiota, F. Leblanc, J. -Y. Chaufray, I. Yoshikawa

    JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS　120　(12)　2037-2052　2015/12

    DOI： 10.1002/2015JE004849 　

    ISSN： 2169-9097

    eISSN： 2169-9100

  46. Brightening event seen in observations of Jupiter's extended sodium nebula Peer-reviewed

    M. Yoneda, M. Kagitani, F. Tsuchiya, T. Sakanoi, S. Okano

    ICARUS　261　31-33　2015/11

    DOI： 10.1016/j.icarus.2015.07.037 　

    ISSN： 0019-1035

    eISSN： 1090-2643

  47. Optical and infrared measurements of planetary atmospheres with the T60 telescope and the future PLANETS mission at Haleakala, Hawaii

    Sakanoi, T, M. Kagitani, Y. Kasaba, T. Obara, S. Okano, J. Kuhn

    2015惑星圏研究会集録　2015

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  48. Remote observation of Jupiter's magnetosphere by EXCEED on Hisaki spacecraft

    Yoshioka K, Murakami G, Kimura T, Tadokoro H, Tao C, Kagitani M, Tsuchiya F, Yamazaki A, Sakanoi T, Kasaba Y

    European Planetary Science Congress 2015, held 27 September-2 October, 2015 in Nantes, France, Online at http://meetingorganizer. copernicus. org/EPSC2015, id. EPSC2015-157　10　157　2015

  49. EUV Oxygen Dayglow at Venus Observed by Hisaki Peer-reviewed

    Masunaga, K, Seki, K, Terada, N, Tsuchiya, F, Kimura, T, Yoshioka, K, Murakami, G, Yamazaki, A, Kagitani, M, Tao, C, Fedorov, A, Futaana, Y, Shiota, D, Yoshikawa, I

    LPSC　2015

  50. Field-of-View Guiding Camera on the HISAKI (SPRINT-A) Satellite Peer-reviewed

    A. Yamazaki, F. Tsuchiya, T. Sakanoi, K. Uemizu, K. Yoshioka, G. Murakami, M. Kagitani, Y. Kasaba, I. Yoshikawa, N. Terada, T. Kimura, S. Sakai, K. Nakaya, S. Fukuda, S. Sawai

    Space Science Reviews　184　(1-4)　259-274　2014/11/19

    Publisher: Kluwer Academic Publishers

    DOI： 10.1007/s11214-014-0106-y 　

    ISSN： 1572-9672 0038-6308

    eISSN： 1572-9672

  51. Evidence for global electron transportation into the jovian inner magnetosphere. International-journal Peer-reviewed

    K Yoshioka, G Murakami, A Yamazaki, F Tsuchiya, T Kimura, M Kagitani, T Sakanoi, K Uemizu, Y Kasaba, I Yoshikawa, M Fujimoto

    Science (New York, N.Y.)　345　(6204)　1581-4　2014/09/26

    DOI： 10.1126/science.1256259 　

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    Jupiter's magnetosphere is a strong particle accelerator that contains ultrarelativistic electrons in its inner part. They are thought to be accelerated by whistler-mode waves excited by anisotropic hot electrons (>10 kiloelectron volts) injected from the outer magnetosphere. However, electron transportation in the inner magnetosphere is not well understood. By analyzing the extreme ultraviolet line emission from the inner magnetosphere, we show evidence for global inward transport of flux tubes containing hot plasma. High-spectral-resolution scanning observations of the Io plasma torus in the inner magnetosphere enable us to generate radial profiles of the hot electron fraction. It gradually decreases with decreasing radial distance, despite the short collisional time scale that should thermalize them rapidly. This indicates a fast and continuous resupply of hot electrons responsible for exciting the whistler-mode waves.

  52. Mid-infrared observations of Io's volcanism from the ground in 2011 and 2012 Peer-reviewed

    M. Yoneda, T. Miyata, C. C. C. Tsang, S. Sako, T. Kamizuka, T. Nakamura, T. Asano, M. Uchiyama, K. Okada, Y. Hayashi, Y. Yoshii, M. Kagitani, T. Sakanoi, Y. Kasaba, S. Okano

    ICARUS　236　153-156　2014/07

    DOI： 10.1016/j.icarus.2014.01.019 　

    ISSN： 0019-1035

    eISSN： 1090-2643

  53. Weakening of Jupiter's main auroral emission in response to magnetospheric hot plasma injections

    Badman SV, Bonfond Bertrand, Fujimoto M, Kagitani M, Kasaba Y, Kasahara S, Kimura T, Melin H, Murakami G, Nichols JD, ot

    European Planetary Science Congress 2014, EPSC Abstracts, Vol. 9, id. EPSC2014-671　9　671　2014

  54. 恒星観測によるひさき搭載EXCEEDの軌道上較正

    村上 豪, 吉岡 和夫, 山崎 敦, 木村 智樹, 土屋 史紀, 鍵谷 将人, 坂野井 健, 寺田 直樹, 上水 和典, 宇治 賢太郎, 吉川 一朗

    第14回宇宙科学シンポジウム 講演集　2014

  55. Development of infrared Echelle spectrograph and mid-infrared heterodyne spectrometer on a small telescope at Haleakala, Hawaii for planetary observation Peer-reviewed

    Sakanoi, T, Y. Kasaba, M. Kagitani, H. Nakagawa, J. Kuhn, S. Okano

    Proc. SPIE　9147, Ground-based and Airborn　(91478D)　2014

    DOI： 10.1117/12.2055877 　

    ISSN： 0277-786X

    eISSN： 1996-756X

  56. First detection of [OI] 630 nm emission in the Enceladus torus Peer-reviewed

    Kunihiro Kodama, Masato Kagitani, Shoichi Okano, Nicholas M. Schneider

    GEOPHYSICAL RESEARCH LETTERS　40　(16)　4177-4181　2013/08

    DOI： 10.1002/grl.50799 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  57. Io's volcanism controls Jupiter's radio emissions Peer-reviewed

    M. Yoneda, F. Tsuchiya, H. Misawa, B. Bonfond, C. Tao, M. Kagitani, S. Okano

    GEOPHYSICAL RESEARCH LETTERS　40　(4)　671-675　2013/02

    DOI： 10.1002/grl.50095 　

    ISSN： 0094-8276

    eISSN： 1944-8007

  58. Inter-university Upper atmosphere Global Observation NETwork (IUGONET) project (Journal of Space Science Informatics Japan No.1) Peer-reviewed

    HAYASHI Hiroo, KOYAMA Yukinobu, HORI Tomoaki, TANAKA Yoshimasa, SHINBORI Atsuki, KAGITANI Masato, ABE Shuji, KOUNO Takahisa, YOSHIDA Daiki, UeNo Satoru, KANEDA Naoki, YONEDA Mizuki, TADOKORO Hiroyasu, MOTOBA Tetsuo

    JAXA research and development report　11　113-120　2012/03

    Publisher: 宇宙航空研究開発機構

    ISSN： 1349-1113

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    This paper describes an overview of the Inter-university Upper atmosphere Global Observation NETwork (IUGONET) project and briefly mentions important products to be developed in the project. It is an inter-university program by the National Institute of Polar Research, Tohoku University, Nagoya University, Kyoto University, and Kyushu University to build a database of metadata for ground-based observations of the upper atmosphere. The metadata database will be of great help to researchers in efficiently finding and obtaining observational data spread over the universities and institutes. This should also facilitate synthetic analysis of multi-disciplinary data, which will lead to new types of research in the upper atmosphere. The IUGONET development team designs its metadata format based on the SPASE (Space Physics Archive Search and Extract) data model. Some modifications depending on characteristics of ground-based observations of the upper atmosphere are added. The metadata database system is built on the platform of DSpace with customizations according to the IUGONET metadata. In addition, an analysis software for the observational data provided by the IUGONET institutions is developed based on the TDAS (THEMIS Data Analysis Software suite) library written in IDL (Interactive Data Language).

  59. EXCEED: an extreme ultraviolet spectrometer onboard SPRINT-A Peer-reviewed

    Go Murakami, Kazuo Yoshioka, Atsushi Yamazaki, Kazunori Uemizu, Hiroaki Ishii, Kentaro Uji, Ichiro Yoshikawa, Masato Kagitani, Fuminori Tsuchiya

    SPACE TELESCOPES AND INSTRUMENTATION 2012: ULTRAVIOLET TO GAMMA RAY　8443　84432Y　2012

    DOI： 10.1117/12.927244 　

    ISSN： 0277-786X

    eISSN： 1996-756X

  60. Earth-orbiting extreme ultraviolet spectroscopic mission: SPRINT-A/EXCEED

    Yoshikawa I, Tsuchiya F, Yamazaki A, Yoshioka K, Uemizu K, Murakami G, Kimura T, Kagitani M, Terada N, Kasaba Y

    European Planetary Science Congress 2012　1　363　2012

  61. Hot electron component in the Io plasma torus confirmed through EUV spectral analysis Peer-reviewed

    K. Yoshioka, I. Yoshikawa, F. Tsuchiya, M. Kagitani, G. Murakami

    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS　116　2011/09

    DOI： 10.1029/2011JA016583 　

    ISSN： 0148-0227

  62. Hot electron component in the Io plasma torus confirmed through EUV spectral analysis Peer-reviewed

    K. Yoshioka, I. Yoshikawa, F. Tsuchiya, M. Kagitani, G. Murakami

    Journal of Geophysical Research: Space Physics　116　(9)　2011

    Publisher: Blackwell Publishing Ltd

    DOI： 10.1029/2011JA016583 　

    ISSN： 2169-9402

  63. An EUV spectrometer on earth-orbiting satellite for planetary science Peer-reviewed

    Hiroaki Ishii, Kouichi Sakai, Tatsuro Homma, Ichiro Yoshikawa, Kazuo Yoshioka, Go Murakami, Munetaka Ueno, Atsushi Yamazaki, Kazunori Uemizu, Masato Kagitani, Fuminori Tsuchiya, Naoki Terada

    Proceedings of SPIE - The International Society for Optical Engineering　8145　2011

    DOI： 10.1117/12.892085 　

    ISSN： 0277-786X

  64. Detection of hot electron in the Io plasma torus through the EUV spectrum taken by the ultraviolet spectro imager on board the Cassini Peer-reviewed

    Kazuo Yoshioka, Ichiro Yoshikawa, Fuminori Tsuchiya, Masato Kagitani, Go Murakami

    J. Geophys. Res.　116　A09204　2011/01

    DOI： 10.1029/2011JA016583 　

  65. The EXCEED mission Peer-reviewed

    Ichiro Yoshikawa, Kazuo Yoshioka, Go Murakami, Gentaro Ogawa, Munetaka Ueno, Atsushi Yamazaki, Kazunori Uemizu, Shingo Kameda, Fuminori Tsuchiya, Masato Kagitani, Naoki Terada, Yasumasa Kasaba

    Advances in Geosciences: Volume 25: Planetary Science (PS)　29-41　2011/01/01

    Publisher: World Scientific Publishing Co.

    DOI： 10.1142/9789814355377_0003 　

  66. Variation in lunar sodium exosphere measured from lunar orbiter SELENE (Kaguya) Peer-reviewed

    M. Kagitani, M. Taguchi, A. Yamazaki, I. Yoshikawa, G. Murakami, K. Yoshioka, S. Kameda, S. Okano

    PLANETARY AND SPACE SCIENCE　58　(12)　1660-1664　2010/10

    DOI： 10.1016/j.pss.2010.07.025 　

    ISSN： 0032-0633

  67. Jupiter's magnetospheric change by Io's volcanoes Peer-reviewed

    M. Yoneda, H. Nozawa, H. Misawa, M. Kagitani, S. Okano

    GEOPHYSICAL RESEARCH LETTERS　37　L11202　2010/06

    DOI： 10.1029/2010GL043656 　

    ISSN： 0094-8276

  68. Plasmaspheric EUV images seen from lunar orbit: Initial results of the extreme ultraviolet telescope on board the Kaguya spacecraft Peer-reviewed

    I. Yoshikawa, G. Murakami, G. Ogawa, K. Yoshioka, Y. Obana, M. Taguchi, A. Yamazaki, S. Kameda, M. Nakamura, M. Kikuchi, M. Kagitani, S. Okano, W. Miyake

    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS　115　2010/04

    DOI： 10.1029/2009JA014978 　

    ISSN： 2169-9380

    eISSN： 2169-9402

  69. First sequential images of the plasmasphere from the meridian perspective observed by KAGUYA Peer-reviewed

    Go Murakami, Ichiro Yoshikawa, Yuki Obana, Kazuo Yoshioka, Gentaro Ogawa, Atsushi Yamazaki, Masato Kagitani, Makoto Taguchi, Masayuki Kikuchi, Shingo Kameda, Masato Nakamura

    EARTH PLANETS AND SPACE　62　(4)　E9-E12　2010

    DOI： 10.5047/eps.2010.02.006 　

    ISSN： 1343-8832

  70. 東北大における惑星大気研究：将来地上・探査機観測に向けて

    笠羽康正, 岡野章一, 村田功, 坂野井健, 寺田直樹, 藤原均, 中川広務, 鍵谷将人, 垰千尋, 寺田香織

    第24回大気圏シンポジウム講演集　2010

  71. Extreme ultraviolet spectroscope for exospheric dynamics explore (exceed) Peer-reviewed

    Ichiro Yoshikawa, Kazuo Yoshioka, Go Murakami, Atsushi Yamazaki, Shingo Kameda, Munetaka Ueno, Naoki Terada, Fuminori Tsuchiya, Masato Kagitani, Yasumasa Kasaba

    Advances in Geosciences: Volume 19: Planetary Science (PS)　19　579-592　2010/01/01

    Publisher: World Scientific Publishing Co.

    DOI： 10.1142/9789812838162_0043 　

  72. Earth-orbiting extreme ultraviolet spectroscopic imaging mission for planetary space science Peer-reviewed

    Kouichi Sakai, Go Murakami, Gentaro Ogawa, Tatsuro Homma, Ichiro Yoshikawa, Kazuo Yoshioka, Munetaka Ueno, Atsushi Yamazaki, Kazunori Uemizu, Masato Kagitani, Fuminori Tsuchiya, Naoki Terada

    SPACE TELESCOPES AND INSTRUMENTATION 2010: ULTRAVIOLET TO GAMMA RAY　7732　2010

    DOI： 10.1117/12.853565 　

    ISSN： 0277-786X

    eISSN： 1996-756X

  73. EUV spectroscopic imaging observations of the first mission of Japanese small scientific satellites series Peer-reviewed

    Kouichi Sakai, Go Murakami, Gentaro Ogawa, Tatsuro Homma, Ichiro Yoshikawa, Kazuo Yoshioka, Munetaka Ueno, Atsushi Yamazaki, Kazunori Uemizu, Masato Kagitani, Fuminori Tsuchiya, Naoki Terada

    ADVANCES IN X-RAY/EUV OPTICS AND COMPONENTS V　7802　2010

    DOI： 10.1117/12.853566 　

    ISSN： 0277-786X

    eISSN： 1996-756X

  74. Short-term variability of Jupiter's extended sodium nebula Peer-reviewed

    Mizuki Yoneda, Masato Kagitani, Shoichi Okano

    ICARUS　204　(2)　589-596　2009/12

    DOI： 10.1016/j.icarus.2009.07.023 　

    ISSN： 0019-1035

  75. First optical observation of the Moon's sodium exosphere from the lunar orbiter SELENE (Kaguya) Peer-reviewed

    M. Kagitani, M. Taguchi, A. Yamazaki, I. Yoshikawa, G. Murakami, K. Yoshioka, S. Kameda, F. Ezawa, T. Toyota, S. Okano

    EARTH PLANETS AND SPACE　61　(8)　1025-1029　2009

    ISSN： 1343-8832

  76. Observation of the lunar sodium exposure using UPI-TVIS onboard SELENE (Kaguya) Peer-reviewed

    M. Kagitani, M. Taguchi, A. Yamazaki, I. Yoshikawa, G. Murakami, K. Yoshioka, S. Kameda, F. Ezawa, T. Toyota, S. Okano

    Earth Planet. Space　61　(1-5)　2009

  77. First optical observation of the moon's sodium exosphere from the lunar orbiter SELENE (Kaguya) Peer-reviewed

    M. Kagitani, M. Taguchi, A. Yamazaki, I. Yoshikawa, G. Murakami, K. Yoshioka, S. Kameda, F. Ezawa, T. Toyota, S. Okano

    Earth, Planets and Space　61　(8)　1025-1029　2009

    DOI： 10.1186/BF03352953 　

    ISSN： 1880-5981 1343-8832

  78. 木星磁気圏内でのピックアップイオンの熱化に関する計算機実験 Peer-reviewed

    加藤雄人, 杉山徹, 土屋史紀, 鍵谷将人, 小野高幸, 三澤浩昭, 森岡昭, 岡野章一

    SENAC　41　(1)　13-19　2008/01/01

  79. Short-term Variation Of Jupiter's Extended Sodium Nebula

    Yoneda, M, M. Kagitani, S. Okano

    Bul. Amer. Astro. Soc.　39　(3)　2007

  80. Implication for the solar wind effect on the Io plasma torus Peer-reviewed

    H. Nozawa, H. Misawa, M. Kagitani, F. Tsuchiya, S. Takahashi, A. Morioka, T. Kimura, S. Okano, H. Yamamoto, R. Sood

    GEOPHYSICAL RESEARCH LETTERS　33　(16)　2006/08

    DOI： 10.1029/2005GL025623 　

    ISSN： 0094-8276

  81. Ground-based observations of sodium in Mercuryüfs exosphere

    Kameda, S, Kagitani, M, Ono, J, Nozawa, H, Yoshikawa, I, Okano, S

    36th COSPAR Scientific Assembly. Held 16 - 23 July 2004, in Beijing, China　2384　2006/07

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Misc. 29

  1. Overview of the LAPYUTA mission (Life-environmentology, Astronomy, and PlanetarY Ultraviolet Telescope Assembly) International-journal

    Fuminori Tsuchiya, Go Murakami, Atsushi Yamazaki, Shingo Kameda, Tomoki Kimura, Ryoichi Koga, Kei Masunaga, Shotaro Sakai, Masahiro Ikoma, Akifumi Nakayama, Masami Ouchi, Masaomi Tanaka, Shin Toriumi, Masato Kagitani, Kazuo Yoshioka, Chihiro Tao, Hajime Kita, Hidenobu Yajima, Hideo Sagawa, Hiromu Nakagawa, Hitoshi Hamori, Jun Kimura, Keigo Enya, Kosuke Namekata, Manabu Yamada, Masaki Kuwabara, Naoki Terada, Naoya Ozaki, Norio Narita, Sae Aizawa, Seiko Takagi, Shinitiro Sakai, Shohei Aoki, Shoya Matsuda, Shuya Tan, Takahiro Sumi, Takanori Kodama, Takashi Moriya, Takatoshi Shibuya, Takehiko Satoh, Taro Kawano, Nozomu Tominaga, Toshifumi Shimizu, Yasumasa Kasaba, Yoichi Yatsu, Yoshiaki Ono, Yudai Suzuki, Yuichi Matsuda, Yuki Harada, Yuta Notsu

    Proceedings of the SPIE　13093　2024/08/21

    DOI： 10.1117/12.3017298 　

  2. Axisymmetric conductivities of Jupiter’s middle- and low-latitude ionosphere

    NAKAMURA Yuki, TERADA Koichiro, TAO Chihiro, TERADA Naoki, KASABA Yasumasa, KITA Hajime, NAKAMIZO Aoi, YOSHIKAWA Akimasa, OHTANI Shinichi, TSUCHIYA Fuminori, KAGITANI Masato, SAKANOI Takeshi, MURAKAMI Go, YOSHIOKA Kazuo, KIMURA Tomoki, YAMAZAKI Atsushi, YOSHIKAWA Ichiro

    日本地球惑星科学連合大会予稿集(Web)　2019　2019

  3. 飛翔体による遠隔観測技術を用いた惑星磁気圏の研究

    吉岡和夫, 吉川一朗, 村上豪, 山崎敦, 藤本正樹, 土屋史紀, 鍵谷将人, 木村智樹

    日本物理学会講演概要集(CD-ROM)　73　(1)　ROMBUNNO.22aK608‐4　2018/03/23

    ISSN： 2189-079X

  4. ロングイヤービン・オーロライメージング分光器により観測されたオーロラ赤緑強度比から推定された降下電子エネルギー変動

    八木直志, 坂野井健, 鍵谷将人, 小川泰信, 田口真, 宮岡宏

    日本地球惑星科学連合大会予稿集(Web)　2018　2018

  5. ロングイヤービンにおけるオーロラスペクトログラフによるN2+共鳴散乱光観測

    遠藤友, 坂野井健, 小川泰信, 鍵谷将人

    日本地球惑星科学連合大会予稿集(Web)　2018　2018

  6. Axisymmetric conductivities of Jupiter’s middle- and low-latitude ionosphere

    NAKAMURA Yuki, TERADA Koichiro, TAO Chihiro, TERADA Naoki, KASABA Yasumasa, KITA Hajime, NAKAMIZO Aoi, YOSHIKAWA Akimasa, OHTANI Shinichi, TSUCHIYA Fuminori, KAGITANI Masato, SAKANOI Takeshi, MURAKAMI Go, YOSHIOKA Kazuo, KIMURA Tomoki, YAMAZAKI Atsushi, YOSHIKAWA Ichiro

    地球電磁気・地球惑星圏学会総会及び講演会(Web)　144th　2018

  7. 3年にわたる「ひさき」衛星による惑星間空間のヘリウム分布光学観測

    山崎敦, 村上豪, 吉岡和夫, 木村智樹, 土屋史紀, 鍵谷将人, 坂野井健, 寺田直樹, 笠羽康正, 吉川一朗

    日本地球惑星科学連合大会予稿集(Web)　2018　ROMBUNNO.PEM19‐10 (WEB ONLY)　2018

  8. Study of the Jovian magnetosphere-ionosphere coupling using an ionospheric potential solver: Contributions of H+ and meteoric ions to ionospheric conductivity

    TERADA Koichiro, TAO Chihiro, TERADA Naoki, KASABA Yasumasa, KITA Hajime, NAKAMIZO Aoi, YOSHIKAWA Akimasa, OHTANI Shinichi, TSUCHIYA Fuminori, KAGITANI Masato, SAKANOI Takeshi, MURAKAMI Go, YOSHIOKA Kazuo, KIMURA Tomoki, YAMAZAKI Atsushi, YOSHIKAWA Ichiro

    日本地球惑星科学連合大会予稿集(Web)　2018　ROMBUNNO.PPS01‐P11 (WEB ONLY)　2018

  9. オーロラスペクトログラフによる上部電離圏N2+の共鳴散乱光観測

    遠藤友, 坂野井健, 小川泰信, 鍵谷将人

    地球電磁気・地球惑星圏学会総会及び講演会(Web)　142nd　2017

  10. オーロラスペクトログラフによる上部電離圏N2+の共鳴散乱光観測

    遠藤友, 坂野井健, 小川泰信, 鍵谷将人

    日本地球惑星科学連合大会予稿集(Web)　2017　2017

  11. ひさき衛星による木星オーロラ・プラズマトーラスの極端紫外線観測

    土屋史紀, 木村智樹, 垰千尋, 吉岡和夫, 田所裕康, 鍵谷将人, 村上豪, 山崎敦, 吉川一朗, ひさきサイエンスチーム

    「プラズマ科学における分光計測の高度化と原子分子過程研究の新展開」「原子分子データ応用フォーラムセミナー」合同研究会　2017/01

  12. ひさき衛星によって観測された木星衛星イオの酸素原子中性雲の空間分布

    古賀亮一, 土屋史紀, 鍵谷将人, 坂野井健, 米田瑞生, 吉川一朗, 吉岡和夫, 村上豪, 山崎敦, 木村智樹

    地球電磁気・地球惑星圏学会総会及び講演会(Web)　142nd　ROMBUNNO.R009‐04 (WEB ONLY)　2017

  13. Time variation of 130.4nm atomic oxygen emission near Io observed by Hisaki/EXCEED

    R. Koga, F. Tsuchiya, M. Kagitani, T. Sakanoi, M. Yoneda, I. Yoshikawa, K. Yoshioka, G. Murakami, A, Yamazaki, T. Kimura

    Proceedings of Symposium on Planetary Science 2016　SPS2016_35　2016/04/01

  14. ひさき衛星によるイオ周辺の酸素原子130.4nm発光の時間変動解析

    古賀亮一, 土屋史紀, 鍵谷将人, 坂野井健, 米田瑞生, 吉川一朗, 吉岡和夫, 村上豪, 山崎豪, 木村智樹

    日本天文学会年会講演予稿集　2016　57　2016/02/20

    ISSN： 1347-0639

  15. 衛星イオからのイオン散逸とイオ下流域での電子加熱 -ひさき衛星観測-

    土屋史紀, 米田瑞生, 古賀亮一, 吉岡和夫, 木村智樹, 村上豪, 野澤博正, 鍵谷将人, 坂野井健, 笠羽康正, 吉川一朗

    太陽惑星系宇宙プラズマ中の重イオンに関する研究集会集録　2016/01/27

  16. オーロラスペクトログラフを用いたN2+共鳴散乱光観測によるイオンアップフロー現象

    遠藤友, 坂野井健, 小川泰信, 鍵谷将人

    地球電磁気・地球惑星圏学会総会及び講演会(Web)　140th　2016

  17. TAOとハレアカラ望遠鏡群による木星ならびに小天体の連続観測

    坂野井健, 鍵谷将人, 北元, 笠羽康正, 宮田隆志, 大坪貴文, 臼井文彦, 上塚貴史, 平原靖大, 米田瑞生, 長谷川直, 佐藤隆雄

    日本天文学会年会講演予稿集　2016　2016

    ISSN： 1347-0639

  18. ひさき衛星を用いたイオ周辺の130.4nm酸素原子発光の時間変動解析

    古賀亮一, 坂野井健, 鍵谷将人, 土屋史紀, 米田瑞生, 吉川一朗, 吉岡和夫, 村上豪, 山崎敦, 木村智樹

    地球電磁気・地球惑星圏学会総会及び講演会(Web)　140th　ROMBUNNO.R009‐08 (WEB ONLY)　2016

  19. ひさき衛星極端紫外光観測と地上可視光観測による木星衛星イオの硫黄イオントーラスの時空間変動

    宍戸美日, 坂野井健, 鍵谷将人, 土屋史紀, 吉川一朗, 山崎敦, 吉岡和夫, 村上豪, 木村智樹

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)　138th　ROMBUNNO.R009‐P06　2015

  20. ひさき衛星を用いたイオ周辺の酸素原子極端紫外発光の変動

    古賀亮一, 土屋史紀, 鍵谷将人, 坂野井健, 吉川一朗, 村上豪, 山崎敦, 木村智樹, 吉岡和夫, 米田瑞生

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)　138th　ROMBUNNO.R009‐P04　2015

  21. 「ひさき」衛星による惑星間空間のヘリウム分布

    山崎敦, 吉岡和夫, 村上豪, 木村智樹, 土屋史紀, 鍵谷将人, 坂野井健, 寺田直樹, 笠羽康正, 吉川一朗

    日本地球惑星科学連合大会予稿集(Web)　2015　ROMBUNNO.PEM25‐P05 (WEB ONLY)　2015

  22. S21-01 Evidence of a meteoroid impact or variability of solar wind flux in Mercury's sodium tail

    Abstracts Fall Meeting of the Japanese Society for Planetary Sciences　2011　36-36　2011/10/23

    Publisher: The Japanese Society for Planetary Sciences

  23. 「かぐや」による子午面撮像が明らかにしたプラズマポーズの形成

    村上豪, 吉川一朗, 吉岡和夫, 山崎敦, 鍵谷将人, 田口真, 菊池雅行, 亀田真吾, 中村正人

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)　130th　ROMBUNNO.B006-P009　2011

  24. SPRINT-Aの科学データアーカイブ設計の現状

    木村 智樹, 山崎敦, 鍵谷将人, 土屋史紀, 吉川一朗, 吉岡和夫, 山本幸生

    第11回宇宙科学シンポジウム講演集　2011

  25. Planetary extreme ultraviolet spectrometer boarded on Japan's small satellite

    Kazuo Yoshioka, Go Murakami, Gentaro Ogawa, Ichiro Yoshikawa, Munetaka Ueno, Atsushi Yamazaki, Kazunori Uemizu, Masato Kagitani, Fuminori Tsuchiya

    Proceedings of SPIE - The International Society for Optical Engineering　7435　2009

    DOI： 10.1117/12.825038 　

    ISSN： 0277-786X

  26. 極端紫外分光によるイオプラズマトーラスの観測

    吉岡和夫, 鍵谷将人, 土屋史紀, 村上豪, 上野宗孝, 山崎敦, 吉川一朗

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)　126th　ROMBUNNO.B009-P005　2009

  27. 小型科学衛星シリーズ初号機の概要及び目指すサイエンス

    上野宗孝, 吉川一朗, 吉岡和夫, 寺田直樹, 笠羽康正, 土屋史紀, 鍵谷将人, 三澤浩昭, 高橋幸弘, 坂野井健, 山崎敦, 澤井秀次郎, 福田盛介, 坂井真一郎, 上水和典

    日本天文学会年会講演予稿集　2008　2008

    ISSN： 1347-0639

  28. 小型宇宙望遠鏡TOPSによる惑星オーロラ・電磁圏観測の科学目標

    土屋史紀, 佐藤毅彦, 野澤宏大, 山崎敦, 笠羽康正, 寺田直樹, 垰千尋, 三澤浩昭, 鍵谷将人, 岡野章一, 森岡昭, 荻野竜樹, 深沢圭一郎, 今井一雅

    日本天文学会年会講演予稿集　2007　286　2007/08/20

    ISSN： 1347-0639

  29. 小型宇宙望遠鏡TOPSによる惑星電磁圏領域の科学目標

    土屋史紀, 寺田直樹, 山崎敦, 今井一雅, 深沢圭一郎, 二穴喜文, 鍵谷将人, 亀田真吾, 笠羽康正, 三澤浩昭, 森岡昭, 野澤宏大, 荻野竜樹, 佐藤毅彦, 垰千尋, 上野宗孝, 横田勝一郎, 吉川一朗, 渡部重十, 高橋幸弘

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)　122nd　ROMBUNNO.B009-P028　2007

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Presentations 7

  1. High dynamic-range observation using a 1.8-m off-axis telescope PLANETS: feasibility study and telescope design

    Masato Kagitani, Takeshi Sakanoi, Yasumasa Kasaba, Yasuhiro Hirahara, Mikio Kurita, Jeffrey Kuhn, Svetlana Berdyugina, Marcelo Emilio

    SPIE Astronomical Telescopes + Instrumentation 2020　2020/12/13

  2. A coronagraph using a digital micromirror device as an adaptive occultation mask: design and observational result

    Masato Kagitani, Takeshi Sakanoi, Yasumasa Kasaba, Shoichi Okano

    SPIE Astronomical Telescopes + Instrumentation 2020　2020/12/13

  3. 1.8m 軸外し望遠鏡 PLANETS による 高ダイナミックレンジ観測

    鍵谷 将人, 鈴木 駿久, 坂野井 健, 笠羽 康正, 平原 靖大, 栗田 光樹夫

    日本天文学会　2020/03

  4. High dynamic-range observation using a low-scattered light telescope PLANETS: design and feasibility study

    鍵谷 将人, 坂野井 健, 鈴木 駿久, 平原 靖大, 笠羽 康正

    地球電磁気・地球惑星圏学会　2019/10/24

  5. Structure of Io plasma torus observed with the Tohoku 60-cm telescope International-presentation

    Masato Kagitani, Fuminori Tsuchiya, Kazuo Yoshioka, Go Murakami, Tomoki Kimura, A. Yamazaki, I. Yoshikawa, Takeshi Sakanoi.

    Magnetosphere of outer planets 2019　2019/06/03

  6. Structure of Io plasma torus observed with the Tohoku 60-cm telescope

    Masato Kagitani, Fuminori Tsuchiya, Kazuo Yoshioka, Go Murakami, Tomoki Kimura, A. Yamazaki, I. Yoshikawa, Takeshi Sakanoi.H

    2019/05/27

  7. Observation of ion temperature and corotation deviation on Io plasma torus during an outburst in early 2015

    鍵谷将人, EXCEEDミッションチーム

    Symposium on Planetary Science 2017　2017/02

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Research Projects 14

  1. Nature of Exploding Objects Explored in the UV Sky

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tokyo Institute of Technology

    2023/04/01 - 2028/03/31

  2. 高コントラスト望遠鏡PLANETSによる氷衛星からの噴出活動の解明

    鍵谷 将人

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2022/04/01 - 2025/03/31

  3. Characteristics of dawn-noon side auroras and atmospheric composition changes revealed by ground-based spectroscopic and imaging observations in short wavelength infrared

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: National Institute of Polar Research

    2020/04/01 - 2024/03/31

  4. 低散乱望遠鏡による氷衛星からの噴出活動の解明

    鍵谷 将人

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2019/04/01 - 2023/03/31

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    本研究は、ハワイ・ハレアカラに設置が予定されている1.8mの低散乱望遠鏡(PLANETS望遠鏡)を用いて太陽系の氷天体の活動現象の解明を推進することを目的とする。PLANETS望遠鏡は東北大学が米ハワイ大学他と国際共同で進めているプロジェクトであり、中口径ながら低散乱で高コントラストな光学系を有し、口径8mクラスの一般的な望遠鏡を上回る性能で、氷衛星からの噴出物を始めとする惑星と衛星近傍の微弱発光の観測に対して自前の連続的観測を可能とする。本研究では、低散乱かつ高コントラストを達成する上で要となる、補償光学を備えたコロナグラフの開発を行い、天体輝面から0.2-10秒角の範囲において2-6桁の輝度差を有する対象の観測を実現することを目指す。令和2年度は主として、(1)PLANETS望遠鏡の光学系支持構造、架台および主鏡支持機構の開発検討と試作, (2)ハレアカラ60cm望遠鏡に搭載する補償光学システムおよび可視光分散分光器の開発を実施した。 (1)PLANETS望遠鏡の光学系支持構造案を有限要素法を用いた構造モデルを用いて検証した。検証結果をもとに主に建築用トラスパイプから成る光学系支持構造を設計・製作し、東北大学試作センターおよび飯舘観測所にて仮組立を行い、構造強度を検証した。また前年度に引続き、主鏡の能動支持機構の開発をすすめ、光軸方向支持機構の製作と合わせて光軸鉛直方向支持機構の設計と検証モデルの製作を行った。 (2) 144素子のMEMS可変形鏡と波面センサーから構成される補償光学システムの設計、製作を進め、波面センサーの動作検証を行った。室内実験により不規則な波面誤差を与えた場合に、波面センサーと可変形鏡による閉ループにより波面補償がなされることを確認した。

  5. Development of mid-infrared hollow core waveguide for GIGMICS on the new telescope at Haleakala

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Nagoya University

    2019/04/01 - 2022/03/31

  6. Collaboration between Akatsuki and high-altitude observatories: Venus glory and atmospheric dynamics in clouds

    Satoh Takehiko, NAKATANI Yoshikazu, YONEDA Mizuki, AKITAYA Hiroshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Japan Aerospace EXploration Agency

    2016/04/01 - 2019/03/31

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    We have carried out a research project to understand what is going on with the Venus’ enormous cloud system (vertical extent ~20 km) by investigating its “glory” as a remarkable signature. Obtained results include: (1) size of Venus cloud particles has been quantified by observing glories; (2) spatio-temporal variations of cloud-top altitude are characterized; and (3) the middle-to-lower cloud layer were intensively investigated by analyzing Akatsui/IR2 night-side data. It is becoming clearer how atmosphere circulates and how various atmospheric waves contributes in the clouds. The stationary gravity-wave features, discovered by LIR, are also (partially if not all) visible in our data set. These will lead us to better understandings how gravity waves, circulation in clouds, and others altogether contribute to generate/maintain the peculiar meteorology of Venus. We also demonstrated the usefulness of applying numerical simulation to infer the underlying physics of observed phenomena.

  7. Investigation of solar panels system planets by visible and infrared high-dispersion spectroscopy on small/medium-sized telescopes at Haleakala, Hawaii

    Kasaba Yasumasa

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2015/04/01 - 2018/03/31

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    In cooperation with Univ. Hawaii, we established the operation of 40 cm Schmidt (T40: visible) and 60 cm Cassegrain (T60: visible/infrared) at the top of Haleakala, Hawaii. We attached our infrared/visible spectrometers developed by us, and run T40 and T60 as the telescopes dedicated to solar system planets. They acted as a part of the international observation network supporting to JAXA UV/EUV space telescope 'Hisaki' and NASA Juno (Jupiter), ESA Mars Express, NASA MAVEN, ESA ExoMars Trace Gas Orbiter (Mars), JAXA Akatsuki (Venus), and (Jupiter). We utilized those unique observational tools and achieved the investigations for Jupiter (Io torus structures and links to the magnetosphere, auroral structure and short-time fluctuations), Mars (upper atmospheric temperature and velocity fields, lower atmospheric trace gases), etc.

  8. Development of Fiber IFU and Observation of Venus Cloud Tops

    YAMADA Manabu

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Chiba Institute of Technology

    2014/04/01 - 2018/03/31

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    We have developed a new type method of creating integral field unit (IFU) for two-dimensional spectral imager. Our new method can increase number of fiber in IFU to about thousand. We made a spectral imager for observation of Venus in ultraviolet range by using the new developed IFU. By attaching this device to a telescope, we succeeded obtain many data cube from near 330nm to 500nm of Venus.

  9. Elucidation of auroral polarization by spectral polarization imaging observation

    Sakanoi Takeshi, SHIOKAWA Kazuo, OYAMA Shin-ichiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2014/04/01 - 2018/03/31

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    We aim to reveal the elevation distribution of auroral polarization along the magnetic meridian by using a newly developed wide field auroral polarization imaging spectrometer. IWe also developed a calibration light system to validate apparent polarization caused by atmospheric scattering and instrument. We installed the instrument at Pokar Flat Research Range, Alaska in November of 2015 and took many calibration data for various field-of-views. Using the calibration data, we evaluated polarization degree with an accuracy better than 0.2 percent. We obtained the linear polarization degree of 630 nm aurora as 1.6 +/- 0.9 percent. For most cases, polarization degree showed a tendency that maximized at the low elevation angle, and decreases as the elevation angle increases. In addition, we contributed the international collaboration with Norway by coordinated EISCAT-radar and optical observations. 4 master students and 2 undergraduate students were graduated based on this study.

  10. Understanding of Jovian atmosphere-ionosphere-magnetosphere coupling process based on optical and radio telescopes from ground and space

    Sakanoi Takeshi, YONEDA Mizuki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2014/04/01 - 2017/03/31

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    The purpose of this study is to clarify the atmosphere-magnetosphere coupling in Jupiter using continuous monitoring data of planetary atmosphere and plasma phenomena obtained with our observation facilities at the summit of Haleakala, Hawaii (altitude 3000 m). In the summer of 2014, the Tohoku University 60 cm telescope was relocated to Haleakala, and we started continuous observation of Io’s sulfur ion torus emission at 673 nm with a visible high-resolution spectrograph. Furthermore, we carried out simultaneous observation of Io’s torus emission and Jupiter’s aurora in the ultra-violet range with a planetary space telescope Hisaki/EXCEED, and examined the causal relationship between the Io torus dynamics and the Jupiter auroral activity associated with the activation of Io’s volcano particularly for the events occurred in January 2015. In addition, we performed the precise observation of Jupiter infrared aurora using the Subaru telescope and NASA/IRTF every year.

  11. Ion temperature anisotorpy measured from Specro-polarimetory of atomic oxygen emission close to Io

    Kagitani Masato

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Tohoku University

    2014/04/01 - 2016/03/31

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    I have developed a spectro-polarimeter fed to 60-cm telescope at Haleakala observatory in order to observe atomic oxygen emission close to jovian satellite, Io. An observation made on February 2016 revealed that the degree of linear polarization (DoLP) is 21 +/- 32% for OI 630.0 nm emission line close to Io. Further observation on May 2016 will enable us to achieve an accuracy of DoLP better than 7%.

  12. Magnetic reconnection at Jupiter as observed from Hawaiian high-altitude facilities at solar maximum

    SATOH Takehiko, FUJIMOTO Masaki, KAGITANI Masato, MISAWA Hiroaki, TOKUMARU Munetoshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Japan Aerospace Exploration Agency

    2012/04/01 - 2015/03/31

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    In conjunction with the solar maximum, attempts were made to monitor Jupiter's infrared auroral activities from high-altitude observing facilities in Hawaii. Jupiter's rotational axis was most tilted from the normal to ecliptic plane at this time period. In such conditions, the IMF (mostly in the ecliptic plane) can be felt by the planet as northwar or southward magnetic fields, resulting in possible enhancement of magnetic reconnections. In the first half of the period, we tried to use a telescope atop Mauna Kea (Hawaii Island), and later half a telescope atop Haleakara (Maui Island). Due to troubles with the telescopes, Jupiter's aurora was not observed. Instead, we successfully obtained Jupiter and its satellite Io data (for monitoring volcanism on Io) in shorter infrared wavelengths. The emissions from Venus' nightside disk were also observed. These will reinforce future collaborations between space missions and high-altitude observing facilities.

  13. Visible and infrared high dispersion spectroscopic investigation of the solar system planets in the Hawaii Haleakala observatory

    KASABA Yasumasa, SAKANOI Takeshi, MURATA Isao, NAKAGAWA Hiromu, KAGITANI Masato, OKANO Shoichi, YOSHIKAWA Ichiro, YAMAZAKI Atsushi, KAMEDA Shingo, TAO Chihiro, YONEDA Mizuki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2012/04/01 - 2015/03/31

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    We Tohoku Univ. have operated 40cm telescope at Mt. Haleakala of Maui Island by the cooperation with Univ. Hawaii. Utilizing its wide FOV and high dispersion spectroscopic capabilities, we investigated (1) the origin of the variations of Herman sodium atmosphere (with NASA/MESSENGER orbiter), (2) the effects of Io torus to Jovian magnetospheric activities (with JAXA/Hisaki EUV space telescope). We also investigated following targets by related telescope and satellites; (3) the search of escaping atmospheres of Venus and Mars (by Hisaki); (4) the study of velocity field and trace gas elements in the upper atmosphere of Venus (at Kitt Peak, Hida, and Haleakala), and (5) the search of crust origin gas (H2O/HDO, CH4) in the Martian atmosphere (at Manua Kea, Haleakala). Moreover, at the Haleakala observatory, (6) we moved 60cm telescope from Iitate, Fukushima (first light: fall 2014), and constructed the 2m telescope (first light: the end of 2016) under the collaboration with Univ. Hawaii.

  14. Jovian ionospheric plasma dynamics based on high-resolution infrared spectroscopic observation

    SAKANOI Takeshi, KASABA Yasumasa, OKANO Shoichi, KAGITANI Masato, TSUCHIYA Fuminori

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2008 - 2010

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    We performed the development of a high-resolution spectrometer for observing Jupiter's infrared auroral intensity and it's Doppler shift in order to clarify the Jupiter's polar ionospheric dynamics. First we carried out detailed discussion on the characteristics of the scientific targets and accordingly, achieved the optical designing to measure Jupiter's aurora. We adopted an Echelle grating for this high-resolution spectrometer. Next we designed and fabricated some important elements of this instrument, such as the Echelle grating holder, the slit viewer and slit unit. However, on the third year in 2010 we discussed the budget allocation in detail, and found considerable shortage of the budget. Therefore, it is necessary to carry out the re-designing of optical system drastically to reduce the cost. Using the instrument with new optical design, we still achieve the scientific subjects of Jupiter's aurora. Mainly due to the re-designing review process, we could not complete the development of instrument during this research period. However, the development will be finised within two years.

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