The Energization of Cold Ions around a Plasmoid in the Magnetotail

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著者

    • TSUBOUCHI Ken
    • Department of Earth and Planetary Physics, The University of Tokyo

抄録

We study numerically the interaction of cold ionospheric ions in the tail lobe with a plasmoid propagating steadily in the tailward direction. We have found that significant energization of cold ions occurs at the encounter with a plasmoid, where three types of the interaction processes are taking place: First, ions show gradient and curvature drift motions as the plasmoid approaches. These ions are accelerated up to ∼1 keV by the cross-tail electric field accompanying with the plasmoid motion (type-I energization). Second, some of the ions get large pitch angles after the type-I acceleration, and then mirror reflected by the plasmoid. These ions are accelerated up to 10 keV after the reflection (type-II energization). Third, the motions of the ions near the plasmoid become highly non-adiabatic, because their gyroradii become comparable to the field-line curvature radius after the type-I energization. Consequently the energy distribution of these ions is broadened in the trailing side of the plasmoid (type-III energization). These theoretical results are successfully compared with the recent GEOTAIL observation showing the dynamic interaction of cold ions with a plasmoid and their subsequent energization.

収録刊行物

  • Journal of geomagnetism and geoelectricity  

    Journal of geomagnetism and geoelectricity 47(2), 149-162, 1995-02 

    Society of Geomagnetism and Earth, Planetary and Space Sciences

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各種コード

  • NII論文ID(NAID)
    10002026380
  • NII書誌ID(NCID)
    AA00698879
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00221392
  • データ提供元
    CJP書誌  J-STAGE 
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