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| Titel |
An intense SFE and SSC event in geomagnetic H, Y and Z fields at the Indian chain of observatories |
| VerfasserIn |
R. G. Rastogi, D. R. K. Rao, S. Alex, B. M. Pathan, T. S. Sastry |
| 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 ; 15, no. 10 ; Nr. 15, no. 10, S.1301-1308 |
| Datensatznummer |
250012976
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| Publikation (Nr.) |
 copernicus.org/angeo-15-1301-1997.pdf |
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| Zusammenfassung |
| Changes in the three components of
geomagnetic field are reported at the chain of ten geomagnetic observatories in
India during an intense solar crochet that occurred at 1311 h 75° EMT on 15
June 1991 and the subsequent sudden commencement (SSC) of geomagnetic storm at
1518 h on 17 June 1991. The solar flare effects (SFE) registered on the
magnetograms appear to be an augmentation of the ionospheric current system
existing at the start time of the flare. An equatorial enhancement in
ΔH due to SFE is observed to be similar in nature to the
latitudinal variation of SQ (H) at low latitude. ΔY
registered the largest effect at 3.6° dip latitude at the fringe region of the
electrojet. ΔZ had positive amplitudes at the equatorial
stations and negative at stations north of Hyderabad. The SSC amplitude in the H
component is fairly constant with latitude, whereas the Z component again
showed larger positive excursions at stations within the electrojet belt. These
results are discussed in terms of possible currents of internal and external
origin. The changes in the Y field strongly support the idea that
meridional current at an equatorial electrojet station flows in the ionospheric
dynamo, E. |
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