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| Titel |
Low latitude ionospheric effects of major geomagnetic storms observed using TOPEX TEC data |
| VerfasserIn |
Y. O. Migoya-Orué, S. M. Radicella, P. Coïsson |
| 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 ; 27, no. 8 ; Nr. 27, no. 8 (2009-08-11), S.3133-3139 |
| Datensatznummer |
250016618
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3133-2009.pdf |
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| Zusammenfassung |
Low latitude ionospheric effects of two major geomagnetic storms are
analysed using TOPEX TEC data for specific satellite passes. The storms are
the one that started on 15 July 2000 and the one that started on 8 November
2004. The variation of vertical TEC as a function of latitude along the
satellite passes during day-time mostly in the region of the Pacific Ocean
have been analysed comparing the storm period with quiet conditions. It has
to be noted that for obvious reasons the TEC behaviour over this region
cannot be observed using ground-based instruments but TOPEX data give a
reasonable overall view of the region covered by the Equatorial Anomaly,
just as the storms were developing.
The performance of vertical TEC obtained from GPS derived TEC of global
ionospheric maps (GIMs) are compared with the TOPEX data in order to
determine their accuracy when storms of this type take place.
The results show that the Equatorial Anomaly TEC peaks move towards the
poles by several degrees and increase their intensity with respect to the
quiet conditions behaviour for both storms that occurred at different
seasons and solar activity level. This behaviour is not well represented by
the maps of the different GIMs used in this study. The rate of change
obtained from TOPEX TEC were computed to look for vertical TEC spatial
gradients variations. |
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