Rocket Observation of Sub‐Relativistic Electrons in the Quiet Dayside Auroral Ionosphere

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  • T. Namekawa
    Japan Aerospace Exploration Agency Sagamihara Japan
  • T. Mitani
    Japan Aerospace Exploration Agency Sagamihara Japan
  • K. Asamura
    Japan Aerospace Exploration Agency Sagamihara Japan
  • Y. Miyoshi
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • K. Hosokawa
    The University of Electro‐Communications Chofu Japan
  • Y. Ogawa
    National Institute of Polar Research Tachikawa Japan
  • S. Saito
    National Institute of Information and Communications Technology Tokyo Japan
  • T. Hori
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • S. Sugo
    The University of Tokyo Tokyo Japan
  • O. Kawashima
    The University of Tokyo Tokyo Japan
  • S. Kasahara
    The University of Tokyo Tokyo Japan
  • R. Nomura
    Japan Aerospace Exploration Agency Sagamihara Japan
  • N. Yagi
    Tohoku University Sendai Japan
  • M. Fukizawa
    Tohoku University Sendai Japan
  • T. Sakanoi
    Tohoku University Sendai Japan
  • Y. Saito
    Japan Aerospace Exploration Agency Sagamihara Japan
  • A. Matsuoka
    Kyoto University Kyoto Japan
  • I. Shinohara
    Japan Aerospace Exploration Agency Sagamihara Japan
  • Y. Fedorenko
    Polar Geophysical Institute Apatity Russia
  • A. Nikitenko
    Polar Geophysical Institute Apatity Russia
  • C. Koehler
    Colorado Space Grant Consortium Boulder CO USA

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<jats:title>Abstract</jats:title><jats:p>An energy spectrum of electrons from 180 to 550 keV precipitating into the dayside polar ionosphere was observed under a geomagnetically quiet condition (AE ≤ 100 nT, Kp = 1‐). The observation was carried out at 73–184 km altitudes by the HEP instrument onboard the RockSat‐XN sounding rocket that has been launched from Andøya, Norway. The observed energy spectrum of precipitating electrons follows a power law of −4.9 ± 0.4 and the electron flux does not vary much over the observation period (∼274.4 s). A nearby ground‐based VLF receiver observation at Lovozero, Russia shows the presence of whistler‐mode wave activities during the rocket observation. A few minutes before the RockSat‐XN observation, POES18/MEPED observed precipitating electrons, which also suggest whistler‐mode chorus wave activities at the location close to the rocket trajectory. A test‐particle simulation for wave‐particle interactions was carried out using the data of the Arase satellite as the initial condition which was located on the duskside. The result of the simulation shows that whistler‐mode waves can resonate with sub‐relativistic electrons at high latitudes. These results suggest that the precipitation observed by RockSat‐XN is likely to be caused by the wave‐particle interactions between whistler‐mode waves and sub‐relativistic electrons.</jats:p>

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