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Data-driven simulation of rapid flux enhancement of energetic electrons with an upper-band whistler burst
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  • Shinji Saito,
  • Satoshi Kurita,
  • Yoshizumi Miyoshi,
  • Satoshi Kasahara,
  • Shoichiro Yokota,
  • Kunihiro Keika,
  • Tomoaki Hori,
  • Yoshiya Kasahara,
  • Shoya Matsuda,
  • Masafumi Shoji,
  • Satoko Nakamura,
  • Ayako Matsuoka,
  • Shun Imajo,
  • Iku Shinohara
Shinji Saito
National Institute of Information and Communications Technology

Corresponding Author:s.saito@nict.go.jp

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Satoshi Kurita
Kyoto University
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Yoshizumi Miyoshi
Institute for Space-Earth Environmental Research, Nagoya University
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Satoshi Kasahara
The University of Tokyo
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Shoichiro Yokota
Graduate School of Science, Osaka University
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Kunihiro Keika
The University of Tokyo
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Tomoaki Hori
Institute for Space-Earth Environmental Research (ISEE), Nagoya University
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Yoshiya Kasahara
Kanazawa University
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Shoya Matsuda
Japan Aerospace Exploration Agency
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Masafumi Shoji
Nagoya University
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Satoko Nakamura
Institute for Space-Earth Environmental Research, Nagoya University
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Ayako Matsuoka
Kyoto University
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Shun Imajo
Nagoya University
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Iku Shinohara
Japan Aerospace Exploration Agency
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Abstract

The temporal variation of the energetic electron flux distribution caused by whistler mode chorus waves through the cyclotron resonant interaction provides crucial information on how electrons are accelerated in the Earth’s inner magnetosphere. This study employing a data-driven test-particle simulation demonstrates that the rapid deformation of energetic electron distribution observed by the Arase satellite is not simply explained by a quasi-linear diffusion mechanism, but is essentially caused by nonlinear scattering: the phase trapping and the phase dislocation. In response to upper-band whistler chorus bursts, multiple nonlinear interactions finally achieve an efficient flux enhancement of electrons on a time scale of the chorus burst. A quasi-linear diffusion model tends to underestimate the flux enhancement of energetic electrons as compared with a model based on the realistic dynamic frequency spectrum of whistler waves. It is concluded that the nonlinear phase trapping plays an important role in the rapid flux enhancement of energetic electrons observed by Arase.
Apr 2021Published in Journal of Geophysical Research: Space Physics volume 126 issue 4. 10.1029/2020JA028979