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ファイル | 記述 | サイズ | フォーマット | |
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2022JA030428.pdf | 3.17 MB | Adobe PDF | 見る/開く |
タイトル: | Nonlinear Wave Growth of Whistler-Mode Hiss Emissions in a Uniform Magnetic Field |
著者: | Liu, Yin Omura, Yoshiharu https://orcid.org/0000-0002-6683-3940 (unconfirmed) |
著者名の別形: | 劉, 胤 大村, 善治 |
キーワード: | wave particle interaction whistler-mode wave hiss plasmasphere magnetosphere particle simulation |
発行日: | May-2022 |
出版者: | American Geophysical Union (AGU) |
誌名: | Journal of Geophysical Research: Space Physics |
巻: | 127 |
号: | 5 |
論文番号: | e2022JA030428 |
抄録: | We conduct electromagnetic particle simulations in a uniform magnetic environment to verify the nonlinear wave growth process of plasmaspheric hiss in the equatorial plasmasphere. The satisfaction of the separability criterion for coexisting multiple frequency waves in the initial stage of wavenumber-time evolution declares that wave packets are coherent and capable of growing nonlinearly. Spatial and temporal evolutions of two typical modes located in wavenumber-time evolution demonstrate the consistency among wave growths, frequency variations, and inhomogeneity factor S in coherent wave packets, showing that rising and falling tones occur at negative and positive S values, respectively, and an obvious wave growth happens in a reasonable range of S satisfying the second-order resonance condition. Wave packets extracted from wave fields in space and time by a frequency band-pass filter confirm a good agreement between the nonlinear theory and simulation results. The nonlinear growth rates of the extracted wave packets possess similar magnitudes to the growth rates of wave packets in the simulation, and they are much greater than the theoretical linear growth rate, indicating that the nonlinear process is essential in the generation of plasmaspheric hiss. |
著作権等: | © 2022. American Geophysical Union. All Rights Reserved. The full-text file will be made open to the public on 24 November 2022 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. |
URI: | http://hdl.handle.net/2433/277582 |
DOI(出版社版): | 10.1029/2022JA030428 |
出現コレクション: | 学術雑誌掲載論文等 |
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