論文

査読有り 筆頭著者
2019年

Characteristics of CME- and CIR-Driven Ion Upflows in the Polar Ionosphere

Journal of Geophysical Research: Space Physics
  • Ogawa, Y.
  • ,
  • Seki, K.
  • ,
  • Keika, K.
  • ,
  • Ebihara, Y.

124
5
開始ページ
3637
終了ページ
3649
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1029/2018JA025870
出版者・発行元
American Geophysical Union ({AGU})

© 2019. American Geophysical Union. All Rights Reserved. We investigated how velocity and flux of ionospheric ion upflows vary during magnetic storms driven by corotating interaction regions (CIRs) and coronal mass ejections (CMEs), using data from the European Incoherent Scatter (EISCAT) Tromsø UHF and Svalbard radars between 1996 and 2015. The characteristics of ion upflows were compared with ion and electron temperature variations measured with the EISCAT radars and also joule heating rate, electric field, and field-aligned current distribution derived from the Weimer model. Upward ion velocity increases in the nighttime at Tromsø (66.2 °N geomagnetic latitude) just after the CIR- and CME-driven storms, corresponding to electron temperature enhancements due to soft particle precipitation and also ion temperature enhancements in the strong westward electric field region. The CME-driven storms have larger upward ion flux (~1.7 × 1013 m2/s) than those under the CIR-driven storms (~0.3 × 1013 m2/s). In the daytime, ion upflows are seen at Longyearbyen, Svalbard (75.2 °N geomagnetic latitude), with an upward flux of typically 1013 m2/s for small CIR and CME storm cases. Substantial ion upflows last for a few days after the storm onsets under small CIR storms, whereas they last for only a day under small CME storms. Under both the cases, the substantial ion upflows are associated with an enhancement of the Region 1 field-aligned current, eastward electric field and Joule heating rate. For large CME storms, substantial ion upflows are absent in the daytime probably due to equatorward expansion of the auroral oval.

リンク情報
DOI
https://doi.org/10.1029/2018JA025870
URL
http://www.scopus.com/inward/record.url?eid=2-s2.0-85065802175&partnerID=MN8TOARS 本文へのリンクあり
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85065802175&origin=inward
ID情報
  • DOI : 10.1029/2018JA025870
  • ISSN : 2169-9380
  • eISSN : 2169-9402
  • ORCIDのPut Code : 65994473
  • SCOPUS ID : 85065802175

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