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| Titel |
Longitudinal study of the ionospheric response to the geomagnetic storm of 15 May 2005 and manifestation of TADs |
| VerfasserIn |
S. Sharma, P. Galav, N. Dashora, R. Pandey |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 6 ; Nr. 29, no. 6 (2011-06-17), S.1063-1070 |
| Datensatznummer |
250017040
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1063-2011.pdf |
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| Zusammenfassung |
| Response of low latitude ionosphere to the geomagnetic storm of 15 May 2005
has been studied using total electron content (TEC) data, obtained from
three GPS stations namely, Yibal, Udaipur and Kunming situated near the
northern crest of equatorial ionization anomaly at different longitudes.
Solar wind parameters, north-south component of the interplanetary magnetic
field (IMF Bz) and AE index data have been used to infer the strength of the
geomagnetic storm. A large value of eastward interplanetary electric field
at 06:15 UT, during the time of maximum southward IMF Bz has been used to
infer the transmission of an eastward prompt penetration electric field
(PPEF) which resulted in a peak in TEC at 07:45 UT due to the local uplift of
plasma in the low latitudes near the anomaly crest over a wide range of
longitudes. Wave-like modulations superposed over the second enhancement in
TEC between 09:15 UT to 10:30 UT have been observed at all the three stations.
The second enhancement in TEC along with the modulations of up to 5 TECU
have been attributed to the combined effect of super plasma fountain and
traveling atmospheric disturbances (TAD). Observed large enhancements in TEC
are a cause of concern for satellite based navigation and ground
positioning. Increased [O/N2] ratio between 09:15 UT to 10:15 UT when
modulations in TEC have been also observed, confirms the presence of TADs
over a wide range of longitudes. |
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