Formation and evolution of the ionospheric plasma density shoulder and its relationship to the superfountain effects investigated during the 6 November 2001 great storm

Horvath, Ildiko and Lovell, Brian C. (2008) Formation and evolution of the ionospheric plasma density shoulder and its relationship to the superfountain effects investigated during the 6 November 2001 great storm. Journal of Geophysical Research, 113 12 Article - A12315: 1-17. doi:10.1029/2008JA013153

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Author Horvath, Ildiko
Lovell, Brian C.
Title Formation and evolution of the ionospheric plasma density shoulder and its relationship to the superfountain effects investigated during the 6 November 2001 great storm
Journal name Journal of Geophysical Research   Check publisher's open access policy
ISSN 0148-0227
Publication date 2008-12-31
Year available 2008
Sub-type Article (original research)
DOI 10.1029/2008JA013153
Open Access Status File (Author Post-print)
Volume 113
Issue 12 Article - A12315
Start page 1
End page 17
Total pages 17
Place of publication Washington, DC, USA
Publisher American Geophysical Union
Language eng
Subject 260603 Ionospheric and Magnetospheric Physics
810199 Defence not elsewhere classified
970102 Expanding Knowledge in the Physical Sciences
020107 Mesospheric, Ionospheric and Magnetospheric Physics
C1
0401 Atmospheric Sciences
Abstract This study investigates the 6 November 2001 great storm’s impact on the topside ionosphere utilizing data from the onboard TOPEX/Poseidon-NASA altimeter, Defense Meteorological Satellite Program–Special Sensor Ions, Electrons and Scintillation instruments and ACE interplanetary observatory. A set of field-aligned profiles demonstrate the storm evolution, caused by the precursor and promptly penetrating interplanetary eastward electric (E) fields, and strong equatorward winds reducing chemical loss, during the long-duration negative BZ events. At daytime-evening, the forward fountain experienced repeated strengthening, as the net eastward E field suddenly increased. The resultant symmetrical equatorial anomaly exhibited a continuous increase,while the energy inputs at both auroral regions were similar. In both hemispheres, by progressing poleward, a midlatitude shoulder exhibiting increased plasma densities, a plasma-density dropoff (steep gradient) and a plasma depletion appeared. These features were maintained while the reverse fountain operated. At the dropoff, elevated temperatures indicated the plasmapause. Consequently, the plasma depletion was the signature of plasmaspheric erosion. In each hemisphere, an isolated plasma flow, supplying the minimum plasma, was detected at the shoulder. Plasmaspheric compression, due to the enhanced E fields, could trigger this plasma flow. Exhibiting strong longitudinal variation at evening-nighttime, the shoulder increased 306% over the southeastern Pacific, where the nighttime Weddell Sea Anomaly (WSA) appeared before the storm. There, the shoulder indicated the storm-enhanced equatorward section of the quiet time WSA. Owing to the substantial equatorward plasmapause movement, a larger poleward section of the quiet time WSA eroded away, leaving a large depletion behind. This study reports first these (northern, southern) plasma flows and dramatic storm effects on a nighttime WSA.
Keyword Super-fountain
Mid-latitude shoulder
Ionosphere
Plasma
Q-Index Code C1
Q-Index Status Provisional Code

 
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Created: Wed, 29 Apr 2009, 02:48:16 EST by Dr Ildiko Horvath on behalf of Faculty Of Engineering, Architecture & Info Tech