Data‐Driven Simulation of Rapid Flux Enhancement of Energetic Electrons With an Upper‐Band Whistler Burst

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  • S. Saito
    Space Environment Laboratory Applied Electromagnetic Research Institute National Institute of Information and Communications Technology Tokyo Japan
  • S. Kurita
    Research Institute for Sustainable Humanosphere Kyoto University Uji Japan
  • Y. Miyoshi
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • S. Kasahara
    Graduate School of Science University of Tokyo Tokyo Japan
  • S. Yokota
    Graduate School of Science Osaka University Toyonaka Japan
  • K. Keika
    Graduate School of Science University of Tokyo Tokyo Japan
  • T. Hori
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Y. Kasahara
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Ishikawa Japan
  • S. Matsuda
    Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Kanagawa Japan
  • M. Shoji
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • S. Nakamura
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • A. Matsuoka
    Graduate School of Science Kyoto University Kyoto Japan
  • S. Imajo
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • I. Shinohara
    Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Kanagawa Japan

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<jats:title>Abstract</jats:title><jats:p>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 employs a data‐driven test‐particle simulation which demonstrates that the rapid change of energetic electron distribution observed by the Arase satellite cannot be 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.</jats:p>

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