Increase of the tail plasma content during the northward interplanetary magnetic field intervals: Case studies

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  • Masaki N. Nishino
    Department of Earth and Planetary Science University of Tokyo Tokyo Japan
  • Toshio Terasawa
    Department of Earth and Planetary Science University of Tokyo Tokyo Japan
  • Masahiro Hoshino
    Department of Earth and Planetary Science University of Tokyo Tokyo Japan

書誌事項

公開日
2002-09
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2002ja009268
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We have analyzed the structure of the magnetotail current sheet during the northward interplanetary magnetic field (IMF) intervals, using the method devised by <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#jgra16500-bib-0018"><jats:italic>Sergeev et al.</jats:italic> [1998]</jats:ext-link>. Case studies suggest that systematic variations of the current sheet thickness are seen not only during substorm activities but also during a building up phase of the cold dense plasma sheet when the IMF is northward and the magnetosphere is geomagnetically quiet. It is further found that during such northward IMF intervals the plasma “vertical content,” namely the product <jats:italic>N</jats:italic><jats:sub>0</jats:sub>λ with the plasma density <jats:italic>N</jats:italic><jats:sub>0</jats:sub> at the plasma sheet center and the characteristic thickness λ, showed an order‐of‐magnitude increase within several hours. We estimate plasma transport rate during the northward IMF to be as much as 10<jats:sup>26</jats:sup>/s, which cannot be neglected in comparison with that during the southward IMF (∼10<jats:sup>27</jats:sup> s<jats:sup>−1</jats:sup>).</jats:p>

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