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Energy-resolved detection of precipitating electrons of 30-100 keV by a sounding rocket associated with dayside chorus waves
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  • Shin Sugo,
  • Oya Kawashima,
  • Satoshi Kasahara,
  • Kazushi Asamura,
  • Reiko Nomura,
  • Yoshizumi Miyoshi,
  • Yasunobu Ogawa,
  • Keisuke Hosokawa,
  • Takefumi Mitani,
  • Taku Namekawa,
  • Takeshi Sakanoi,
  • Mizuki Fukizawa,
  • Naoshi Yagi,
  • Yury V. Fedorenko,
  • Alexander Nikitenko,
  • Shoichiro Yokota,
  • Kunihiro Keika,
  • Tomoaki Hori,
  • Christopher Koehler
Shin Sugo
The University of Tokyo

Corresponding Author:[email protected]

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Oya Kawashima
The University of Tokyo
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Satoshi Kasahara
The University of Tokyo
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Kazushi Asamura
The Institute of Space and Astronautical Science
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Reiko Nomura
Tsukuba Space Center, Japan Aerospace Exploration Agency
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Yoshizumi Miyoshi
Institute for Space-Earth Environmental Research, Nagoya University
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Yasunobu Ogawa
National Institute of Polar Research
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Keisuke Hosokawa
University of Electro-Communications
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Takefumi Mitani
ISAS/JAXA
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Taku Namekawa
University of Tokyo
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Takeshi Sakanoi
Tohoku University
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Mizuki Fukizawa
Tohoku University
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Naoshi Yagi
Tohoku University
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Yury V. Fedorenko
Polar Geophysical Institute
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Alexander Nikitenko
Polar Geophysical Institute
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Shoichiro Yokota
Osaka University
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Kunihiro Keika
The University of Tokyo
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Tomoaki Hori
Institute for Space-Earth Environmental Research, Nagoya University
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Christopher Koehler
University of Colorado Boulder
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Abstract

Whistler mode chorus waves scatter magnetospheric electrons and cause precipitation into the Earth’s atmosphere. Previous measurements showed that nightside chorus waves are indeed responsible for diffuse/pulsating aurora. Although chorus waves and electron precipitation have also been detected on the dayside, their link has not been illustrated (or demonstrated) in detail compared to the nightside observations. Conventional low-altitude satellite observations do not well resolve the energy range of 10–100 keV, hampering verification on resonance condition with chorus waves. In this paper we report observations of energetic electrons with energies of 30–100 keV that were made by the electron sensor installed on the NASA’s sounding rocket RockSat-XN. It was launched from the Andøya Space Center on the dayside (MLT ~ 11 h) at the L-value of ~ 7 on 13 January 2019. Transient electron precipitation was observed at ~ 50 keV with the duration of <100 s. A ground station at Kola peninsula in Russia near the rocket’s footprint observed intermittent emissions of whistler-mode waves simultaneously with the rocket observations. The energy of precipitating electrons is consistent with those derived from the quasi-linear theory of pitch angle scattering by chorus waves through cyclotron resonance, assuming a typical dayside magnetospheric electron density. Precise interaction region is discussed based on the obtained energy spectrum below 100 keV.
Mar 2021Published in Journal of Geophysical Research: Space Physics volume 126 issue 3. 10.1029/2020JA028477