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タイトル: | Particle Simulation of the Generation of Plasmaspheric Hiss |
著者: | Hikishima, Mitsuru Omura, Yoshiharu https://orcid.org/0000-0002-6683-3940 (unconfirmed) Summers, Danny |
著者名の別形: | 疋島, 充 大村, 善治 |
発行日: | 1-Aug-2020 |
出版者: | American Geophysical Union (AGU) |
誌名: | Journal of Geophysical Research: Space Physics |
巻: | 125 |
号: | 8 |
論文番号: | e2020JA027973 |
抄録: | We have conducted a one‐dimensional electromagnetic particle simulation with a parabolic magnetic field to reproduce whistler‐mode hiss emissions in the plasmasphere. We assume a bi‐Maxwellian distribution with temperature anisotropy for energetic electrons injected into the plasmasphere and find that hiss emissions are generated with spectrum characteristics typical of those observed by spacecraft near the magnetic equator. The hiss emissions contain fine structures involving rising tone and falling tone elements with variation in frequencies. The amplitude profile of the spectra agrees with the optimum wave amplitude derived from the nonlinear wave growth theory. The simulation demonstrates that hiss emissions are generated locally near the magnetic equator through linear and nonlinear interactions with energetic electrons with temperature anisotropy. The coherent hiss emissions efficiently scatter resonant electrons of 2.5–80 keV into the loss cone. |
著作権等: | © 2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/260707 |
DOI(出版社版): | 10.1029/2020JA027973 |
出現コレクション: | 学術雑誌掲載論文等 |
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