Slow Contraction of Flash Aurora Induced by an Isolated Chorus Element Ranging From Lower‐Band to Upper‐Band Frequencies in the Source Region

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  • Mitsunori Ozaki
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • Satoshi Yagitani
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • Kazuo Shiokawa
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Yoshimasa Tanaka
    National Institute of Polar Research Tachikawa Japan
  • Yasunobu Ogawa
    National Institute of Polar Research Tachikawa Japan
  • Keisuke Hosokawa
    The University of Electro‐Communications Chofu Japan
  • Yoshiya Kasahara
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • Yusuke Ebihara
    Research Institute for Sustainable Humanosphere Kyoto University Uji Japan
  • Yoshizumi Miyoshi
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Kousuke Imamura
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • Ryuho Kataoka
    National Institute of Polar Research Tachikawa Japan
  • Shin‐ichiro Oyama
    Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
  • Teppei Chida
    Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan
  • Akira Kadokura
    National Institute of Polar Research Tachikawa Japan

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<jats:title>Abstract</jats:title><jats:p>Flash aurora driven by an isolated chorus element can be a useful ionospheric indicator for identifying the source wave properties via wave‐particle interactions. Using ground observation and modeling approaches, here we report the temporal characteristics of flash aurora that depend on the chorus frequency width and the sweep rate. We found that the contraction time increases more than the expansion time in patchy auroral variations, due to the difference in the minimum electron energies resonated with the chorus wave packet away from the equatorial source to higher latitudes. Especially, the contraction time strongly depends on the higher‐frequency chorus waves due to cyclotron resonance with lower‐energy electrons. The model calculations support that the chorus element ranges from lower‐band to upper‐band frequencies with respect to half the gyrofrequency at the exact generation region. Our study provides the prompt (milliseconds) chorus‐driven electron dynamics through the spatiotemporal characteristics of flash aurora in the ionosphere.</jats:p>

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