Strong Diffusion of Energetic Electrons by Equatorial Chorus Waves in the Midnight‐to‐Dawn Sector

  • S. Kasahara
    Department of Earth and Planetary Science, Graduate School of Science University of Tokyo Bunkyo Japan
  • Y. Miyoshi
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • S. Kurita
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • S. Yokota
    Graduate School of Science Osaka University Toyonaka Japan
  • K. Keika
    Department of Earth and Planetary Science, Graduate School of Science University of Tokyo Bunkyo 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 Japan
  • S. Matsuda
    Institute for Space and Astronautical Sciences JAXA Sagamihara Japan
  • A. Kumamoto
    Graduate School of Science Tohoku University Sendai Japan
  • A. Matsuoka
    Institute for Space and Astronautical Sciences JAXA Sagamihara Japan
  • K. Seki
    Department of Earth and Planetary Science, Graduate School of Science University of Tokyo Bunkyo Japan
  • I. Shinohara
    Institute for Space and Astronautical Sciences JAXA Sagamihara Japan

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<jats:title>Abstract</jats:title><jats:p>Drastic variations of radiation‐belt/ring current electrons are the result of competing processes of acceleration, transport, and loss. For subrelativistic energetic electrons (10–100 keV), one of the promising loss mechanisms is precipitation into the atmosphere due to pitch angle scattering by whistler mode chorus waves. The efficiency of the scattering has yet to be quantified by direct observations, however. Using in situ measurements by the ERG (Arase) spacecraft in the midnight‐to‐dawn sector at and around the magnetic equator, we demonstrate that the full filling of energetic electron loss cones occurs commonly, associated with typical‐amplitude (greater than 50 pT) chorus waves. The spatial distribution of the loss cone filling indicates that the efficient scattering is limited to |MLAT|< 10°.</jats:p>

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