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タイトル: | Upstream Shift of Generation Region of Whistler-Mode Rising-Tone Emissions in the Magnetosphere |
著者: | Nogi, Takeshi Omura, Yoshiharu |
著者名の別形: | 野儀, 武志 大村, 善治 |
キーワード: | whistler-mode chorus wave-particle interaction nonlinear process particle simulation triggered emission |
発行日: | Mar-2023 |
出版者: | American Geophysical Union (AGU) |
誌名: | Journal of Geophysical Research: Space Physics |
巻: | 128 |
号: | 3 |
論文番号: | e2022JA031024 |
抄録: | We have performed a series of simulation runs for whistler-mode wave-particle interaction in a parabolic magnetic field with 12 different frequencies of triggering waves and 3 different plasma frequencies specifying cold plasma densities. Under a given plasma condition, a specific frequency range of the triggering wave exists that can generate rising-tone emissions. The generation region of rising-tone emission shifts upstream. The velocity of the wave generation region is dependent on duration of the subpacket, which is controlled by the formation of the resonant current in the generation region. When the source velocity, which is a sum of the resonance and group velocities, is approximately the same as the velocity of the wave generation region, a long-sustaining rising-tone emission is generated. When the spatial and temporal gap between subpackets exists due to damping phase of short subpacket generation, resonant electrons in the gap of the subpackets are carried at the resonance velocity to the upstream region, and the velocity of the wave generation region becomes large in magnitude. When formation of resonant currents is delayed, the velocity of the generation region becomes smaller than the source velocity in magnitude. Below one quarter of the cyclotron frequency, coalescence of subpackets takes place, suppressing formation of the resonant current in the generation region. Since gradual upstream shift of the generation region is necessary for the wave to grow locally, the source velocity should be a small negative value. |
著作権等: | © 2023 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
URI: | http://hdl.handle.net/2433/282009 |
DOI(出版社版): | 10.1029/2022JA031024 |
出現コレクション: | 学術雑誌掲載論文等 |
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