Storm‐enhanced plasma density features investigated during the Bastille Day Superstorm

Horvath, Ildiko and Lovell, Brian C. (2010) Storm‐enhanced plasma density features investigated during the Bastille Day Superstorm. Journal of Geophysical Research - Space Physics, 115 A06305: 1-13. doi:10.1029/2009JA014674

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Author Horvath, Ildiko
Lovell, Brian C.
Title Storm‐enhanced plasma density features investigated during the Bastille Day Superstorm
Journal name Journal of Geophysical Research - Space Physics   Check publisher's open access policy
ISSN 0148-0227
Publication date 2010-06-15
Year available 2010
Sub-type Article (original research)
DOI 10.1029/2009JA014674
Volume 115
Issue A06305
Start page 1
End page 13
Total pages 13
Editor Wolfgang Baumjohann
Place of publication Washington, DC
Publisher American Geophysical Union
Collection year 2011
Language eng
Subject 810107 National Security
810199 Defence not elsewhere classified
0201 Astronomical and Space Sciences
020109 Space and Solar Physics
020107 Mesospheric, Ionospheric and Magnetospheric Physics
Abstract Field‐aligned passes track true profiles. Such Defense Meteorological Satellite Program passes permitted investigating storm‐enhanced plasma density (SED) feature development during the Bastille Day Superstorm in a comprehensive way. We tracked equatorial ionization anomaly (EIA) and SED features and their underlying forward fountain circulation and downward SED plume plasma flows, respectively. Northward subauroral polarization stream E fields detaching plasma and producing SED plumes were also detected. We assessed the effects of South Atlantic Magnetic Anomaly and summer‐towinter interhemispheric plasma flows on the EIA and found a southward dipping gradient in drift/flow when no storm/evening‐related fountain strengthening occurred. We investigated the relative importance of different plasma sources in SED development. An extremely large plasma enhancement seen over Florida at 2200 UT on 15 July 2000 was a SED feature that was tracked by many GPS total electron content (TEC) maps as a 200 TEC unit(TECU) enhancement. We tracked its equally large conjugate pair over Trelew (Argentine Patagonia) and unraveled their development. Their underlying SED plume supplied most of the plasma. Appearing between these two SED features, a small and highly asymmetrical EIA offered on each side a low baseline upon which the downward streaming SED plume plasma piled up. Contradicting a currently accepted explanation, there was no enhanced fountain action detected to contribute 150 TECU to the 200 TECU. Later (∼2400 UT), there was enhanced fountain action, but SED plume contribution still dominated. Proven by observational evidence, SED development is a complex process of SED plume plasma flows and equatorward wind effects that cannot be described by one single explanation.
Keyword Superstorm
Equatorial ionization anomaly
Storm‐enhanced plasma density
Subauroral polarization stream E fields
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Received 23 July 2009; accepted 7 January 2010; published 15 June 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Security and Surveillance Collection
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 3 times in Scopus Article | Citations
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Created: Fri, 16 Jul 2010, 10:41:02 EST by Dr Ildiko Horvath on behalf of School of Information Technol and Elec Engineering