Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke.148s&link_type=abstract
2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe
Astronomy and Astrophysics
Astrophysics
Scientific paper
ramanselva_iig@rediffmail.com The GPS data obtained from IGS data base corresponding to the quiet and disturbed period of the ionosphere at Equatorial anomaly region in the Indian sector (IISC and HYDE) have shown a remarkable increase in total electron content during storm time on 29th Oct 2003 (Ap= 400, during main phase). The analysis extended for the other regions around the anomaly region (IISC, HYDE, YIBL, KUNM, BAHR and POL2) have revealed similar enhancements during such period. The locations include the crest of the anomaly region to the trough in the Indian longitude as well as extended in east and west of the temperate latitude. The ground-based magnetometer corresponding to the equatorward edge of anomaly region has shown an exceptional agreement in time of IMF, H-field and Dst reversals with the time of the estimated peak TEC. Nevertheless the time of H-field’s reversal maximum seems to subtly delay about a few minutes due to the longitudinal differences with respect to IST. The electron intensity during disturbed time is shown to increase by 46.5% that of the quiet time values measured at anomaly crest region at the reversal time of Dst. The magnetic field reversal with the corresponding reversal of IMF coinciding with peak value of TEC confirms that the electric field penetrations at low latitude region are an instantaneous process. The latitudinal changes of TEC are shown to decrease from crest region to trough much more steeply on quiet times compared to the storm time.
et. al.
Selvamurugan Raman
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