Zobrazeno 1 - 10
of 261
pro vyhledávání: '"Ichiro Oyama"'
Autor:
Ichiro Oyama, Tomohide Kubo, Yoshihisa Fujino, Koji Kadowaki, Masamizu Kunimoto, Kiyoyumi Shirane, Hidetoshi Tabata, Ken Sabanai, Takehiro Nakamura, Shinya Matsuda
Publikováno v:
Scandinavian Journal of Work, Environment & Health, Vol 38, Iss 4, Pp 337-342 (2012)
OBJECTIVES: The aim of this study was to investigate the effect of shift working on the risk of developing impaired glucose tolerance (IGT). METHODS: This study comprised 6413 male employees (5608 daytime workers, 512 3-shift workers and 293 2-shift
Externí odkaz:
https://doaj.org/article/635f934ffd1646848eecfdef0d5ae9f0
Autor:
Rui Chen, Yoshizumi Miyoshi, Xinliang Gao, Quanming Lu, Bruce T. Tsurutani, Keisuke Hosokawa, Tomoaki Hori, Yasunobu Ogawa, Shin‐Ichiro Oyama, Yoshiya Kasahara, Shoya Matsuda, Satoko Nakamura, Ayako Matsuoka, Iku Shinohara
Publikováno v:
Geophysical Research Letters, Vol 51, Iss 16, Pp n/a-n/a (2024)
Abstract We report an Arase‐all sky imager (ASI) conjugate event in which the pulsating aurora (PsA) has a one‐to‐one correspondence with chorus bursts. Wavelet analysis displayed three peaks at ∼0.3 Hz, 4 Hz, and >10 Hz, corresponding to the
Externí odkaz:
https://doaj.org/article/a61b0a3ed61544628daf52098af405fd
Autor:
Shin-ichiro Oyama, Anita Aikio, Takeshi Sakanoi, Keisuke Hosokawa, Heikki Vanhamäki, Lei Cai, Ilkka Virtanen, Marcus Pedersen, Kazuo Shiokawa, Atsuki Shinbori, Nozomu Nishitani, Yasunobu Ogawa
Publikováno v:
Earth, Planets and Space, Vol 75, Iss 1, Pp 1-13 (2023)
Abstract Ion drag associated with the ionospheric plasma convection plays an important role in the high-latitude thermospheric dynamics, yet changes in the thermospheric wind with geomagnetic activity are not fully understood. We performed a statisti
Externí odkaz:
https://doaj.org/article/12474185579b450188a60e5cd3dcdc32
Autor:
Yuki Kawamura, Keisuke Hosokawa, Satonori Nozawa, Yasunobu Ogawa, Tetsuya Kawabata, Shin-Ichiro Oyama, Yoshizumi Miyoshi, Satoshi Kurita, Ryoichi Fujii
Publikováno v:
Earth, Planets and Space, Vol 72, Iss 1, Pp 1-9 (2020)
Abstract Using a ground-based five-wavelength photometer, which has been operative in Tromsø, Norway since February 2017, we have statistically analyzed the lifetime of O(1S) to reveal the emission altitude of pulsating aurora (PsA). For the statist
Externí odkaz:
https://doaj.org/article/f9356eb9ae1d46f69d22d578bb9a846c
Publikováno v:
Earth, Planets and Space, Vol 71, Iss 1, Pp 1-8 (2019)
Abstract The average winds in the thermosphere during geomagnetically quiet times are important because they provide a baseline wind in the upper atmosphere, but they remain insufficiently understood at high latitudes. This paper reports the first di
Externí odkaz:
https://doaj.org/article/ad00e429f01c4c2a96743abaa2bdcc8b
Publikováno v:
Earth, Planets and Space, Vol 71, Iss 1, Pp 1-13 (2019)
Abstract Energy input from the magnetosphere during substorms can strongly affect the high-latitude thermosphere. The ionospheric current caused by thermospheric wind variations may also provide a feedback to the magnetosphere. In this study, we inve
Externí odkaz:
https://doaj.org/article/b7081670b2ea4b939964d12fe5d8dd47
Autor:
Shin-ichiro Oyama, Takuo T. Tsuda, Keisuke Hosokawa, Yasunobu Ogawa, Yoshizumi Miyoshi, Satoshi Kurita, Antti E. Kero, Ryoichi Fujii, Yoshimasa Tanaka, Akira Mizuno, Tetsuya Kawabata, Björn Gustavsson, Thomas Leyser
Publikováno v:
Earth, Planets and Space, Vol 70, Iss 1, Pp 1-7 (2018)
Abstract One of the representative auroral emission lines that radiates from F-region heights and is measurable on the ground is the 777.4 nm line from excited atomic oxygen. This line has been adopted, along with another E-region emission line, for
Externí odkaz:
https://doaj.org/article/8a0e0daf0d8c48dab1dc329c81eb5dc2
Autor:
Masaki Sato1, Kazuo Shiokawa1 shiokawa@nagoya-u.jp, Shin-ichiro Oyama1,2, Yuichi Otsuka1, Atsuki Shinbori1, Oksanen, Arto3
Publikováno v:
Journal of Geophysical Research. Space Physics. Apr2024, Vol. 129 Issue 4, p1-16. 16p.
Autor:
Kazuo Shiokawa, Yasuo Katoh, Yoshiyuki Hamaguchi, Yuka Yamamoto, Takumi Adachi, Mitsunori Ozaki, Shin-Ichiro Oyama, Masahito Nosé, Tsutomu Nagatsuma, Yoshimasa Tanaka, Yuichi Otsuka, Yoshizumi Miyoshi, Ryuho Kataoka, Yuki Takagi, Yuhei Takeshita, Atsuki Shinbori, Satoshi Kurita, Tomoaki Hori, Nozomu Nishitani, Iku Shinohara, Fuminori Tsuchiya, Yuki Obana, Shin Suzuki, Naoko Takahashi, Kanako Seki, Akira Kadokura, Keisuke Hosokawa, Yasunobu Ogawa, Martin Connors, J. Michael Ruohoniemi, Mark Engebretson, Esa Turunen, Thomas Ulich, Jyrki Manninen, Tero Raita, Antti Kero, Arto Oksanen, Marko Back, Kirsti Kauristie, Jyrki Mattanen, Dmitry Baishev, Vladimir Kurkin, Alexey Oinats, Alexander Pashinin, Roman Vasilyev, Ravil Rakhmatulin, William Bristow, Marty Karjala
Publikováno v:
Earth, Planets and Space, Vol 69, Iss 1, Pp 1-21 (2017)
Abstract The plasmas (electrons and ions) in the inner magnetosphere have wide energy ranges from electron volts to mega-electron volts (MeV). These plasmas rotate around the Earth longitudinally due to the gradient and curvature of the geomagnetic f
Externí odkaz:
https://doaj.org/article/232ecf4e2caa48c9a1d198ff31cfe027
Autor:
Masatoshi Yamauchi, Johan De Keyser, George Parks, Shin-ichiro Oyama, Peter Wurz, Takumi Abe, Arnaud Beth, Malcolm Dunlop, Pierre Henri, Harald Kucharek, Octav Marghitu, Georgios Nicolaou, Manabu Shimoyama, Joachim Saur, Satoshi Taguchi, Takuo Tsuda, Bruce Tsurutani
The majority of the atmospheres of solar system bodies are composed of neutral gas, and hence their upper atmosphere are always partially ionized by the solar UV and collisions, allowing a complex nonlinear interaction with interplanetary plasma. Thu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::da791dfb4ccd85b6d2fdcccff635e717
https://doi.org/10.5194/egusphere-egu23-5715
https://doi.org/10.5194/egusphere-egu23-5715
