Direct Observations of Energetic Electron Scattering and Precipitation Due To Whistler‐Mode Waves in the Dayside High‐Density Regions

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  • Shin Sugo
    Graduate School of Science, The University of Tokyo Bunkyo City Japan
  • Satoshi Kasahara
    Graduate School of Science, The University of Tokyo Bunkyo City Japan
  • Yoshizumi Miyoshi
    Institute for Space‐Earth Environmental Research, Nagoya University Nagoya Japan
  • Yuto Katoh
    Graduate School of Science, Tohoku University Sendai Japan
  • Kunihiro Keika
    Graduate School of Science, The University of Tokyo Bunkyo City Japan
  • Shoichiro Yokota
    Graduate School of Science, Osaka University Toyonaka Japan
  • Tomoaki Hori
    Institute for Space‐Earth Environmental Research, Nagoya University Nagoya Japan
  • Yoshiya Kasahara
    Graduate School of Natural Science and Technology, Kanazawa University Kanazawa Japan
  • Shoya Matsuda
    Graduate School of Natural Science and Technology, Kanazawa University Kanazawa Japan
  • Ayako Matsuoka
    Graduate School of Science, Kyoto University Kyoto Japan
  • Iku Shinohara
    Japan Aerospace Exploration Agency/Institute of Space and Astronautical Science Sagamihara Japan
  • Fuminori Tsuchiya
    Graduate School of Science, Tohoku University Sendai Japan
  • Atsushi Kumamoto
    Graduate School of Science, Tohoku University Sendai Japan
  • Satoko Nakamura
    Institute for Space‐Earth Environmental Research, Nagoya University Nagoya Japan
  • Masahiro Kitahara
    Graduate School of Science, Tohoku University Sendai Japan

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<jats:title>Abstract</jats:title><jats:p>Plasmaspheric hiss waves play an important role in electron precipitation, leading to the formation of slot region in the Earth's radiation belt. Previous studies indicate that the electron density and the background magnetic field strength are responsible for the intensity of whistler‐mode waves and resultant electron precipitation. Nevertheless, no direct evidence of the strong pitch angle scattering of energetic electrons by hiss waves inside the plasmasphere has been obtained due to the small loss cone near the magnetic equator, where the scattering occurs. Furthermore, the density and magnetic field structures have not been investigated simultaneously and on the same magnetic field lines as the hiss wave enhancement and electron precipitation. With high angular resolution data of ∼10–100 keV electron flux obtained by the Medium‐Energy Particle experiments‐electron analyzer onboard the Exploration of energization and Radiation in Geospace satellite, we identified two events of the strong electron precipitation. A detailed examination revealed that the precipitation occurs in association with the amplitude enhancement of hiss waves. Moreover, strong scattering occurs simultaneously with electron density enhancements, while the magnetic field strength hardly correlates with the wave intensity. Our direct observations indicate that the electron density and its spatial structure (gradient) are crucial to electron precipitation. The observations also indicate that strong scattering leading to substantial loss cone filling occurs up to the magnetic latitude of ∼15° for the events.</jats:p>

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