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Asamura K, Shoji M, Miyoshi Y, Kasahara Y, Kasaba Y, Kumamoto A, Tsuchiya F, Matsuda S, Matsuoka A, Teramoto M, Kazama Y, Shinohara I. Cross-Energy Couplings from Magnetosonic Waves to Electromagnetic Ion Cyclotron Waves through Cold Ion Heating inside the Plasmasphere. PHYSICAL REVIEW LETTERS 2021; 127:245101. [PMID: 34951776 DOI: 10.1103/physrevlett.127.245101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 10/06/2021] [Accepted: 11/02/2021] [Indexed: 06/14/2023]
Abstract
Using a novel wave-particle interaction analysis, we show observational evidence of energy transfer from fast magnetosonic waves (MSWs) to low-energy protons in the magnetosphere. The analysis clearly indicates that the transferred proton energies are further converted to excite electromagnetic ion cyclotron waves. Since MSWs are excited by hot ions, cross-energy coupling of ions occurs through MSWs. The result also suggests a new energy transfer path of exciting electromagnetic ion cyclotron waves in the magnetosphere, and a complex interplay between various wave modes and particle populations.
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Affiliation(s)
- Kazushi Asamura
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 252-5210, Japan
| | - Masafumi Shoji
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Aichi 464-8601, Japan
| | - Yoshizumi Miyoshi
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Aichi 464-8601, Japan
| | - Yoshiya Kasahara
- Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan
| | - Yasumasa Kasaba
- Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Atsushi Kumamoto
- Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Fuminori Tsuchiya
- Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Shoya Matsuda
- Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan
| | - Ayako Matsuoka
- Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Mariko Teramoto
- Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu, Fukuoka 804-8550, Japan
| | - Yoichi Kazama
- Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 10617, Taiwan
| | - Iku Shinohara
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 252-5210, Japan
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