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  1. B100 理学部/理学研究科
  2. B100a 雑誌掲載論文
  3. 学術雑誌

Rapid increase in relativistic electron flux controlled by nonlinear phase trapping of whistler chorus elements

http://hdl.handle.net/2237/25181
314be8ea-aee8-43ed-bf10-4c2de0d83fab
名前 / ファイル ライセンス アクション
Saito_et_al-2016-Journal_of_Geophysical_Research_Space_Physics.pdf Saito_et_al-2016-Journal_of_Geophysical_Research_Space_Physics.pdf ファイル公開:2017/01/23 (8.4 MB)
Item type 学術雑誌論文 / Journal Article(1)
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
著者 Saito, Shinji

× Saito, Shinji

WEKO 67954

Saito, Shinji

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Miyoshi, Yoshizumi

× Miyoshi, Yoshizumi

WEKO 67955

Miyoshi, Yoshizumi

Search repository
Seki, Kanako

× Seki, Kanako

WEKO 67956

Seki, Kanako

Search repository
権利
権利情報 © 2016 American Geophysical Union
抄録
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.
内容記述タイプ Abstract
出版者
出版者 Wiley
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
ISSN
収録物識別子タイプ ISSN
収録物識別子 2169-9356
書誌情報 JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS

巻 121, 号 7, p. 6573-6589, 発行日 2016-07-23
著者版フラグ
値 publisher
URI
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
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