Ryoichi Fujii
Commendation
For outstanding contributions to the solar-terrestrial physics through pioneering research in magnetosphere-ionosphere-thermosphere coupling, and through organizing international cooperative research platform
A list of five major papers
- R. Fujii, T. Iijima, T. A. Potemra, M. Sugiura,Seasonal dependence of large-scale Birkeland currentsGeophys. Res. Lett., VOL. 8, No. 10, 1105-1106, 1981
- R. Fujii, R. A. Hoffman, P. C. Anderson, J. D. Craven, M. Sugiura, L. A. Frank, N. C. Maynard,Electrodynamic parameters in the nighttime sector during auroral substormsJ. Geophys. Res., VOL. 99, No. A4, 6093-6112, 1994,
- Ryoichi Fujii, Satonori Nozawa, Nobuo Matuura, Asgeir Brekke,Study on neutral wind contribution to the electrodynamics in the polar ionosphere usingEISCAT CP-1 data,J. Geophys. Res., VOL. 103, NO. A7, 14,731-14,739, 1998
- Ryoichi Fujii, Satonori Nozawa, Stephan C. Buchert, Asgeir Brekke,Statistical characteristics of electromagnetic energy transfer between the magnetosphere,the ionosphere, and the thermosphere,J. Geophys. Res., VOL. 104, NO. A2, 2357-2365, 1999,
- R. Fujii, O. Amm, A. Yoshikawa, A. Ieda, H. VanhamäkiReformulation and energy flow of the Cowling channel,J. Geophys. Res., VOL. 116, A02305, 2011
Major achievements
Dr. Ryoichi Fujii made pioneering research achievements in the coupling of the Earth’s magnetosphere-ionosphere-thermosphere system, contributing to the advancement of solar-terrestrial science. Through the analysis of multiple satellite observation data, he was the first to demonstrate that the primary source of Birkeland currents is a voltage-driven source related to the magnetospheric convection electric field, as well as to reveal the distribution of field-aligned currents associated with auroral substorms and the electromagnetic characteristics of the relationship between electric fields and convection. Additionally, through EISCAT radar observations, he discovered the importance of neutral atmospheric motion in the coupling of the magnetosphere-ionosphere-thermosphere system. Furthermore, he re-evaluated the relationship between Hall and Pedersen currents and field-aligned currents, and proposed a new model that accurately describes the dynamics of electric fields and currents within the Cowling channel. In addition to research, Dr. Fujii promoted collaborative use in the field of Earth and planetary sciences, held key positions in academic organizations both domestically and internationally, and devoted himself to facilitating the planning of large-scale research projects. His efforts greatly contributed to elevating the status of solar-terrestrial science and Earth and planetary sciences as a whole.
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Nominator
Nakamura, Takuji
Supporters
Yasunobu Ogawa, Kazuo Shiokawa, Eiichi Tajika