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  2. Go Murakami

Go Murakami

  (村上 豪)

Profile Information

Affiliation
Associate Professor, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
J-GLOBAL ID
201901001752900088
researchmap Member ID
B000359749

Research Interests

 7

Research Areas

 3

Research History

 5

Education

 3

Major Awards

 8
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Papers

 156
  • Gaku Kinoshita, Beatriz Sanchez-Cano, Yoshizumi Miyoshi, Laura Rodríguez-García, Emilia Kilpua, Benoit Lavraud, Mathias Rojo, Marco Pinto, Yuki Harada, Go Murakami, Yoshifumi Saito, Shoichiro Yokota, Daniel Heyner, David Fischer, Nicolas Andre, Kazuo Yoshioka
    The Astrophysical Journal, 997(1) 2-2, Jan 13, 2026  Peer-reviewed
    Abstract Interplanetary coronal mass ejections (ICMEs) cause “Forbush decreases” (FDs), which are local decreases in background galactic cosmic rays (GCRs). Even though FDs can be observed with simple particle instruments, their amplitude and shape provide physical profiles of passing ICMEs. However, in some cases, previous statistical studies of the heliocentric distance dependence of FD changes associated with ICME propagation have found no strong correlation. We need the criteria for evaluating the relationship between ICME structure and FDs, necessary for the FD’s statistical analysis. This study investigates the effect of the evolution and interactions of ICMEs on FD profiles in the inner solar system using multipoint comparisons. We focus on multipoint ICME observations by Solar Orbiter, BepiColombo, and near-Earth spacecraft from 2022 March 10 to 16, when these spacecraft were ideally located for studying the radial and longitudinal evolution of ICMEs and accompanying FDs. We compared GCR variations with the multiple in situ data and ICME model, clarifying the correspondence between the evolution of each ICME structure in the radial and azimuthal directions and the depth and gradients of the FD. The radial comparison revealed decreases in FD intensities and gradients associated with the expansion of the ICME. The longitudinal difference found in FD intensity indicates longitudinal variations of the ICME’s shielding effect. These results suggest that accurate multipoint FD comparisons require determining the relationship between the observer’s position and the inner structure of the passing ICMEs.
  • Mitsunori Ozaki, Satoshi Yagitani, Yasumasa Kasaba, Yoshiya Kasahara, Shoya Matsuda, Yoshiharu Omura, Mitsuru Hikishima, Fouad Sahraoui, Laurent Mirioni, Gerard Chanteur, Go Murakami
    NATURE COMMUNICATIONS, 17(1), Jan 1, 2026  Peer-reviewed
  • Mitsunori Ozaki, Satoshi Yagitani, Yasumasa Kasaba, Yoshiya Kasahara, Shoya Matsuda, Fouad Sahraoui, Laurent Mirioni, Gerard Chanteur, Go Murakami
    EARTH PLANETS AND SPACE, 77(1), Nov 12, 2025  Peer-reviewed
  • Yudai Suzuki, Kazuo Yoshioka, Kei Masunaga, Hideyo Kawakita, Yoshiharu Shinnaka, Go Murakami, Tomoki Kimura, Fuminori Tsuchiya, Atsushi Yamazaki, Ichiro Yoshikawa
    Icarus, 441 116720-116720, Nov, 2025  Peer-reviewed
  • Beatriz Sánchez-Cano, Lina Z. Hadid, Sae Aizawa, Go Murakami, Yumi Bamba, Shota Chiba, Takuya Hara, Daniel Heyner, George Ho, Kazumasa Iwai, Emilia Kilpua, Gaku Kinoshita, Benoit Lavraud, Yoshizumi Miyoshi, Marco Pinto, Daniel Schmid, Daikou Shiota, Rami Vainio, Nicolas Andre, Alessandro Aronica, Sami Asmar, Hans-Ulrich Auster, Stas Barabash, Alain Barthe, Wolfgang Baumjohann, Johannes Benkhoff, Mark Bentley, Emma Bunce, Paolo Cappuccio, Dominique Delcourt, Ivan di Stefano, Irene Doria, Nina Dresing, Andrei Fedorov, David Fischer, Bjorn Fiethe, Markus Fränz, Jan Gieseler, Franz Giner, Gabriel Giono, Yuki Harada, Hauke Hussmann, Luciano Iess, Takeshi Imamura, Harald Jeszenszky, Geraint Jones, Bruno Katra, Adrian Kazakov, Alexander Kozyrev, Gunter Laky, Carlo Lefevre, Herbert Lichtenegger, Simon Lindsay, Marco Lucente, Carmelo Magnafico, Werner Magnes, Adrian Martindale, Ayako Matsuoka, Anna Milillo, Igor Mitrofanov, Gaku Nishiyama, Philipp Oleynik, Stefano Orsini, Meegyeong Paik, Christian Palmroos, Christina Plainaki, Emanuel Penou, Moa Persson, Francesco Quarati, Eric Quémerais, Ingo Richter, Rozenn Robidel, Mathias Rojo, Yoshifumi Saito, Francesco Santoli, Alexander Stark, Mirko Stumpo, Rong Tian, Ali Varsani, Christopher Verdeil, Hayley Williamson, Olivier Witasse, Shoichiro Yokota
    Earth, Planets and Space, 77(1), Jul 17, 2025  Peer-reviewed
    Abstract BepiColombo, the joint ESA/JAXA mission to Mercury, was launched in October 2018 and is scheduled to arrive at Mercury in November 2026 after an 8-year cruise. Like other planetary missions, its scientific objectives focus mostly on the nominal, orbiting phase of the mission. However, due to the long duration of the cruise phase covering distances between 1.2 and 0.3 AU, the BepiColombo mission has been able to outstandingly contribute to characterise the solar wind and transient events encountered by the spacecraft, as well as planetary environments during the flybys of Earth, Venus, and Mercury, and contribute to the characterisation of the space radiation environment in the inner Solar System and its evolution with solar activity. In this paper, we provide an overview of the cruise observations of BepiColombo, highlighting the most relevant science cases, with the aim of demonstrating the importance of planetary missions to perform cruise observations, to contribute to a broader understanding of Space Weather in the Solar System, and in turn, increase the scientific return of the mission. Graphical Abstract
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Misc.

 134
  • 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, Aug 21, 2024  
  • 土屋史紀, 村上豪, 山崎敦, 亀田真吾, 鍵谷将人, 吉岡和夫, 古賀亮一, 木村淳, 木村智樹, 垰千尋, 益永圭, 堺正太朗, 中山陽史, 生駒大洋, 成田憲保, 大内正己, 田中雅臣, 桑原正輝, 鳥海森, 野津湧太, 行方宏介
    日本天文学会年会講演予稿集, 2024, 2024  
  • 土屋史紀, 村上豪, 山崎敦, 亀田真吾, 鍵谷将人, 吉岡和夫, 古賀亮一, 木村淳, 木村智樹, 垰千尋, 益永圭, 堺正太朗, 中山陽史, 生駒大洋, 成田憲保, 大内正己, 大内正己, 田中雅臣, 桑原正輝, 鳥海森, 野津湧太, 行方宏介
    日本天文学会年会講演予稿集, 2024, 2024  
  • 土屋史紀, 村上豪, 山崎敦, 亀田真吾, 伴谷将人, 吉岡和夫, 古賀亮一, 木村淳, 木村智樹, 垰千尋, 益永圭, 堺正太朗, 中山陽史, 生駒大洋, 成田憲保, 大内正己, 大内正己, 田中雅臣, 桑原正輝, 鳥海森, 野津湧太, 行方宏介
    地球電磁気・地球惑星圏学会総会及び講演会(Web), 156th, 2024  
  • 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
    Abstract EGU 2023, May 15, 2023  Invited
    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.
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Research Projects

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