論文

査読有り
2011年3月

A statistical study of the response of the dayside equatorial F-2 layer to the main phase of intense geomagnetic storms as an indicator of penetration electric field

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
  • N. Balan
  • M. Yamamoto
  • V. Sreeja
  • I. S. Batista
  • K. J. W. Lynn
  • M. A. Abdu
  • S. Ravindran
  • T. Kikuchi
  • Y. Otsuka
  • K. Shokawa
  • S. Alex
  • 全て表示

116
3
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1029/2010JA016001
出版者・発行元
AMER GEOPHYSICAL UNION

The response of the dayside equatorial F-2 layer to the main phases of the 22 intense geomagnetic storms (Dst < -150 nT) in 1998-2008 is investigated using the digital ionosonde data from the equatorial stations in Brazilian, Indian, and Australian longitudes together with equatorial electrojet strength and IMF B-z; the storms include 15 superstorms (Dst < -200 nT). The observations show that there is a period during all MPs when the F-2 layer peak rises (and falls) rapidly with large peak electron density (Nmax) reduction, the rise velocity strongly correlates with the intensity (Dst) of the storms, and the duration of the Nmax reduction corresponds to that of strong eastward electrojet when IMF Bz remains highly negative. The observations indicate the occurrence of strong eastward prompt penetration electric fields (PPEF) during the rapid F-2 layer response. The PPEF drives the F-2 layer peak rapidly upward, which reduces Nmax due to vertical expansion and diffusion. The results therefore suggest that the rapid F-2 layer response (rapid rise (and fall) of peak height (hmax) with large Nmax reduction) observed by ionosondes can be used to detect the occurrence of the daytime eastward PPEF during intense geomagnetic storms irrespective of season and level of solar activity. The data also show two rare events of strong daytime westward electric fields due to disturbance dynamo and/or prompt penetration. The results are important when radars are not available to monitor the occurrence of the PPEF.

リンク情報
DOI
https://doi.org/10.1029/2010JA016001
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000288872900001&DestApp=WOS_CPL
URL
http://www.scopus.com/inward/record.url?eid=2-s2.0-79953242604&partnerID=MN8TOARS
URL
http://orcid.org/0000-0002-4957-764X
ID情報
  • DOI : 10.1029/2010JA016001
  • ISSN : 2169-9380
  • ORCIDのPut Code : 49519962
  • SCOPUS ID : 79953242604
  • Web of Science ID : WOS:000288872900001

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