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EMIC Waves Converted From Equatorial Noise Due to M/Q=2 Ions in the Plasmasphere: Observations From Van Allen Probes and Arase
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SYSNO ASEP 0511925 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title EMIC Waves Converted From Equatorial Noise Due to M/Q=2 Ions in the Plasmasphere: Observations From Van Allen Probes and Arase Author(s) Miyoshi, Y. (JP)
Matsuda, S. (JP)
Kurita, S. (JP)
Nomura, K. (JP)
Keika, K. (JP)
Shoji, M. (JP)
Kitamura, N. (JP)
Kasahara, Y. (JP)
Matsuoka, A. (JP)
Shinohara, I. (JP)
Shiokawa, K. (JP)
Machida, S. (JP)
Santolík, Ondřej (UFA-U) RID, ORCID
Boardsen, S.A. (US)
Horne, R. B. (GB)
Wygant, J.F. (US)Number of authors 16 Source Title Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 46, č. 11 (2019), s. 5662-5669Number of pages 8 s. Publication form Print - P Language eng - English Country US - United States Keywords EMIC ; magnetsonic waves ; Arase ; Van Allen Probes ; plasmasphere ; Q=2 ions ; M Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Open access Institutional support UFA-U - RVO:68378289 UT WOS 000477616200004 EID SCOPUS 85067680130 DOI 10.1029/2019GL083024 Annotation Equatorial noise (EN) emissions are observed inside and outside the plasmapause. EN emissions are referred to as magnetosonic mode waves. Using data from Van Allen Probes and Arase, we found conversion from EN emissions to electromagnetic ion cyclotron (EMIC) waves in the plasmasphere and in the topside ionosphere. A low-frequency part of EN emissions becomes EMIC waves through branch splitting of EN emissions, and the mode conversion from EN to EMIC waves occurs around the frequency of M/Q = 2 (deuteron and/or alpha particles) cyclotron frequency. These processes result in plasmaspheric EMIC waves. We investigated the ion composition ratio by characteristic frequencies of EN emissions and EMIC waves and obtained ion composition ratios. We found that the maximum composition ratio of M/Q = 2 ions is similar to 10% below 3,000 km. The quantitative estimation of the ion composition will contribute to improving the plasma model of the deep plasmasphere and the topside ionosphere. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2020 Electronic address https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019GL083024
Number of the records: 1