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Rapid increase in relativistic electron flux controlled by nonlinear phase trapping of whistler chorus elements
http://hdl.handle.net/2237/25181
http://hdl.handle.net/2237/25181314be8ea-aee8-43ed-bf10-4c2de0d83fab
名前 / ファイル | ライセンス | アクション |
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Saito_et_al-2016-Journal_of_Geophysical_Research_Space_Physics.pdf ファイル公開:2017/01/23 (8.4 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2016-12-12 | |||||
タイトル | ||||||
タイトル | Rapid increase in relativistic electron flux controlled by nonlinear phase trapping of whistler chorus elements | |||||
言語 | en | |||||
著者 |
Saito, Shinji
× Saito, Shinji× Miyoshi, Yoshizumi× Seki, Kanako |
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アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
権利 | ||||||
言語 | en | |||||
権利情報 | © 2016 American Geophysical Union | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Wave-particle interactions with whistler chorus waves are believed to provide a primary acceleration for electrons in the outer radiation belt. Previous models for flux enhancement of the radiation belt have assumed the stochastic process as a diffusion manner of successive random-phase interactions, but physical mechanisms for the acceleration are not fully incorporated in these models because of the lack of a nonlinear scattering process. Here we report rapid increase in relativistic electron flux by using an innovative computer simulation model that incorporates not only diffusive process but also nonlinear scattering processes. The simulations show that three types of scattering simultaneously occur, which are diffusive, phase trapping, and phase bunching. It is found that the phase trapping is the most efficient mechanism to produce the MeV electrons rapidly in the scattering processes. The electrons are accelerated from 400 keV to over 1 MeV in time scale less than 60 s. On the other hand, as the phase trapping is suppressed by the breaking of relative phase angle between waves and gyrating electrons during the interaction, the increase of electron flux at MeV energy is clearly reduced. Our simulations conclude that the phase-trapping process causes a significant effect for the increase in relativistic electron flux and suggest that a quasi-linear diffusion model is not always valid to fully describe the relativistic electron acceleration. | |||||
言語 | en | |||||
出版者 | ||||||
出版者 | Wiley | |||||
言語 | en | |||||
言語 | ||||||
言語 | eng | |||||
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資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
出版タイプ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1002/2016JA022696 | |||||
ISSN | ||||||
収録物識別子タイプ | EISSN | |||||
収録物識別子 | 2169-9356 | |||||
書誌情報 |
en : JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 巻 121, 号 7, p. 6573-6589, 発行日 2016-07-23 |
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値 | publisher | |||||
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識別子 | http://doi.org/10.1002/2016JA022696 | |||||
識別子タイプ | DOI | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2237/25181 | |||||
識別子タイプ | HDL |