Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Kunihiro Keika"'
Autor:
Ryuho Kataoka, Yoshizumi Miyoshi, Kazuo Shiokawa, Nozomu Nishitani, Kunihiro Keika, Takanobu Amano, Kanako Seki
Publikováno v:
Geophysical Research Letters, Vol 51, Iss 12, Pp n/a-n/a (2024)
Abstract We report a citizen science‐motivated study on the cause of an unusually bright red aurora as witnessed from Hokkaido, Japan during a magnetic storm on 1 December 2023. The auroral brightness of 5 kR is unusual for the Dst index peak of on
Externí odkaz:
https://doaj.org/article/90f6c755cdeb46d49c2120bca5ed5c96
Autor:
Bernhard Haas, Yuri Y. Shprits, Michael Wutzig, Mátyás Szabó-Roberts, Marina García Peñaranda, Angelica M. Castillo Tibocha, Julia Himmelsbach, Dedong Wang, Yoshizumi Miyoshi, Satoshi Kasahara, Kunihiro Keika, Shoichiro Yokota, Iku Shinohara, Tomo Hori
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-12 (2024)
Abstract The hazardous plasma environment surrounding Earth poses risks to satellites due to internal charging and surface charging effects. Accurate predictions of these risks are crucial for minimizing damage and preparing for system failures of sa
Externí odkaz:
https://doaj.org/article/2e5e706b85884a6392cfb358786e03f8
Autor:
Vladimir Borisovich Belakhovsky, Vyacheslav A. Pilipenko, Elizaveta E. Antonova, Yoshizumi Miyoshi, Yoshiya Kasahara, Satoshi Kasahara, Nana Higashio, Iku Shinohara, Tomoaki Hori, Shoya Matsuda, Shoichiro Yokota, Takeshi Takashima, Mitani Takefumi, Kunihiro Keika, Satoko Nakamura
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-17 (2023)
Abstract Variations of relativistic electron fluxes (E ≥ 1 MeV) and wave activity in the Earth magnetosphere are studied to determine the contribution of different acceleration mechanisms of the outer radiation belt electrons: ULF mechanism, VLF me
Externí odkaz:
https://doaj.org/article/b618eec4ec1240928bbbbc2e77f43598
Autor:
Xiao-Jia Zhang, Anton Artemyev, Vassilis Angelopoulos, Ethan Tsai, Colin Wilkins, Satoshi Kasahara, Didier Mourenas, Shoichiro Yokota, Kunihiro Keika, Tomoaki Hori, Yoshizumi Miyoshi, Iku Shinohara, Ayako Matsuoka
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-8 (2022)
Energetic electron densities in the radiation belt increases during geomagnetic storms. Here, the authors show oblique whistler mode waves enhance electron losses and create strong fluxes of about 100 keV electrons precipitating into the atmosphere,
Externí odkaz:
https://doaj.org/article/13112056ddb9468eb612fa8859bba6f2
Autor:
Shoichiro Yokota, Naoki Terada, Ayako Matsuoka, Naofumi Murata, Yoshifumi Saito, Dominique Delcourt, Yoshifumi Futaana, Kanako Seki, Micah J. Schaible, Kazushi Asamura, Satoshi Kasahara, Hiromu Nakagawa, Masaki N. Nishino, Reiko Nomura, Kunihiro Keika, Yuki Harada, Shun Imajo
Publikováno v:
Earth, Planets and Space, Vol 73, Iss 1, Pp 1-18 (2021)
Abstract The mass spectrum analyzer (MSA) will perform in situ observations of ions and magnetic fields around Phobos as part of the Martian Moons eXploration (MMX) mission to investigate the origin of the Martian moons and physical processes in the
Externí odkaz:
https://doaj.org/article/c67c0922827f4e8b98958b916a2d0d6f
Autor:
Naritoshi Kitamura, Kanako Seki, Kunihiro Keika, Yukitoshi Nishimura, Tomoaki Hori, Masafumi Hirahara, Eric J. Lund, Lynn M. Kistler, Robert J. Strangeway
Publikováno v:
Earth, Planets and Space, Vol 73, Iss 1, Pp 1-20 (2021)
Abstract The ionosphere is one of the important sources for magnetospheric plasma, particularly for heavy ions with low charge states. We investigate the effect of solar illumination on the number flux of ion outflow using data obtained by the Fast A
Externí odkaz:
https://doaj.org/article/f26d26be2700465d8ace3b1575397cd3
Autor:
Yoshizumi Miyoshi, Tomoaki Hori, Masafumi Shoji, Mariko Teramoto, T. F. Chang, Tomonori Segawa, Norio Umemura, Shoya Matsuda, Satoshi Kurita, Kunihiro Keika, Yukinaga Miyashita, Kanako Seki, Yoshimasa Tanaka, Nozomu Nishitani, Satoshi Kasahara, Shoichiro Yokota, Ayako Matsuoka, Yoshiya Kasahara, Kazushi Asamura, Takeshi Takashima, Iku Shinohara
Publikováno v:
Earth, Planets and Space, Vol 70, Iss 1, Pp 1-11 (2018)
Abstract The Exploration of energization and Radiation in Geospace (ERG) Science Center serves as a hub of the ERG project, providing data files in a common format and developing the space physics environment data analysis software and plug-ins for d
Externí odkaz:
https://doaj.org/article/32c41a9db5b94039b1de9ff1d2be2c2c
Autor:
Kanako Seki, Yoshizumi Miyoshi, Yusuke Ebihara, Yuto Katoh, Takanobu Amano, Shinji Saito, Masafumi Shoji, Aoi Nakamizo, Kunihiro Keika, Tomoaki Hori, Shin’ya Nakano, Shigeto Watanabe, Kei Kamiya, Naoko Takahashi, Yoshiharu Omura, Masahito Nose, Mei-Ching Fok, Takashi Tanaka, Akimasa Ieda, Akimasa Yoshikawa
Publikováno v:
Earth, Planets and Space, Vol 70, Iss 1, Pp 1-28 (2018)
Abstract Understanding of underlying mechanisms of drastic variations of the near-Earth space (geospace) is one of the current focuses of the magnetospheric physics. The science target of the geospace research project Exploration of energization and
Externí odkaz:
https://doaj.org/article/d1b7fe27fb574414be2c88cdc36f1a22
Autor:
Kunihiro Keika, Yoshizumi Miyoshi, Shinobu Machida, Akimasa Ieda, Kanako Seki, Tomoaki Hori, Yukinaga Miyashita, Masafumi Shoji, Iku Shinohara, Vassilis Angelopoulos, Jim W. Lewis, Aaron Flores
Publikováno v:
Earth, Planets and Space, Vol 69, Iss 1, Pp 1-10 (2017)
Abstract This paper introduces ISEE_3D, an interactive visualization tool for three-dimensional plasma velocity distribution functions, developed by the Institute for Space-Earth Environmental Research, Nagoya University, Japan. The tool provides a v
Externí odkaz:
https://doaj.org/article/dd66a9d4614f483292c7134a301328f7
Autor:
Chae-Woo Jun, Yoshizumi Miyoshi, Satoko Nakamura, Masafumi Shoji, Masahiro Kitahara, Tomoaki Hori, Chao Yue, Jacob Bortnik, Larry R. Lyons, Kyungguk Min, Yoshiya Kasahara, Fuminori Tsuchiya, Atsushi Kumamoto, Kazushi Asamura, Iku Shinohara, Ayako Matsuoka, Shun Imajo, Shoichiro Yokota, Satoshi Kasahara, Kunihiro Keika
Publikováno v:
Journal of Geophysical Research: Space Physics.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0351d3d907e1e86c404c5fa48bc0b02c
https://doi.org/10.1029/2022ja031131
https://doi.org/10.1029/2022ja031131