Energetic Electron Precipitation Associated With Pulsating Aurora Observed by VLF Radio Propagation During the Recovery Phase of a Substorm on 27 March 2017

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  • F. Tsuchiya
    Planetary Plasma and Atmospheric Research Center, Graduate School of Science Tohoku University Sendai Japan
  • A. Hirai
    Planetary Plasma and Atmospheric Research Center, Graduate School of Science Tohoku University Sendai Japan
  • T. Obara
    Planetary Plasma and Atmospheric Research Center, Graduate School of Science Tohoku University Sendai Japan
  • H. Misawa
    Planetary Plasma and Atmospheric Research Center, Graduate School of Science Tohoku University Sendai Japan
  • S. Kurita
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Y. Miyoshi
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • K. Shiokawa
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • M. Connors
    Center for Science Athabasca University AB Canada
  • M. Ozaki
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • Y. Kasahara
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • A. Kumamoto
    Graduate School of Science Tohoku University Sendai Japan
  • Y. Kasaba
    Planetary Plasma and Atmospheric Research Center, Graduate School of Science Tohoku University Sendai Japan
  • A. Matsuoka
    Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan
  • M. Shoji
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • I. Shinohara
    Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan

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<jats:title>Abstract</jats:title><jats:p>Recent studies suggest that electrons with energies up to several hundred keV precipitate into the atmosphere associated with pulsating aurora (PsA). It is debated the highest energy of precipitating electrons associated with PsA. Here we report for the first time that the energy extends to relativistic energies. PsA was observed by THEMIS all‐sky imagers during a substorm that occurred on 27 March 2017. Energetic electron precipitation was detected by very low frequency subionospheric propagation. We found similar time variations between the auroral intensity and perturbation of the received radio signal intensity when the PsA occurred on the radio path. The perturbation showed a short recovery time of ~2 s. The recovery time indicates relaxation from ionospheric modification due to energetic electron precipitation and depends on the stopping altitude of the electrons. The recovery time required a stopping altitude of 50–60 km and indicates that the PsA is accompanied by relativistic electron precipitation.</jats:p>

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