論文

査読有り
2007年11月

Dynamic variations of a convection flow reversal in the subauroral postmidnight sector as seen by the SuperDARN Hokkaido HF radar

GEOPHYSICAL RESEARCH LETTERS
  • Ryuho Kataoka
  • ,
  • Nozomu Nishitani
  • ,
  • Yusuke Ebihara
  • ,
  • Keisuke Hosokawa
  • ,
  • Tadahiko Ogawa
  • ,
  • Takashi Kikuchi
  • ,
  • Yoshizumi Miyoshi

34
21
開始ページ
21105
終了ページ
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1029/2007GL031552
出版者・発行元
AMER GEOPHYSICAL UNION

The SuperDARN Hokkaido HF radar, capable of measuring the subauroral ionospheric plasma convection especially during storms, has been in continuous operation since the beginning of December 2006. We report the first two- dimensional observation of a dynamic variation of convection flow reversal in subauroral postmidnight sector during the storm main phase on 29 January 2007. The flow reversal region is extended over 20 degrees in longitude and 5 degrees in latitude, lasting for about 10 - 15 min, and the maximum flow speed is about 0.5 - 1.0 km/ s. The flow reversal structure is reasonably reproduced by the ring current simulation coupled with the ionosphere, suggesting that it is produced by the region 2 field- aligned current associated with the ring current enhancement during the storm main phase. The dynamic variation of the flow reversal structure is interpreted as a transient eastward extension of the elongated dusk convection cell to the postmidnight and equatorward of the dawn cell, associated with the variation of the ring current whose structure is controlled by the interplanetary magnetic field and solar wind dynamic pressure. It is suggested that the ring current variation is highly coupled with the interplanetary parameters and is much more complicated than ever thought.

リンク情報
DOI
https://doi.org/10.1029/2007GL031552
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000251059200004&DestApp=WOS_CPL
ID情報
  • DOI : 10.1029/2007GL031552
  • ISSN : 0094-8276
  • eISSN : 1944-8007
  • Web of Science ID : WOS:000251059200004

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