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| Titel |
Geomagnetic field variations at the equatorial electrojet station in Sri Lanka, Peredinia |
| VerfasserIn |
R. G. Rastogi, T. Kitamura, K. Kitamura |
| 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 ; 22, no. 8 ; Nr. 22, no. 8 (2004-09-07), S.2729-2739 |
| Datensatznummer |
250014960
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| Publikation (Nr.) |
 copernicus.org/angeo-22-2729-2004.pdf |
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| Zusammenfassung |
| The paper discusses the variations of the horizontal (H), vertical (Z) and
eastward (Y) components of the geomagnetic field at Peredinia (PRD), an
electrojet station in Sri Lanka, with the time of the day, season, sudden
commencement (SSC) and during geomagnetic storms. The daily variation of H showed a large peak around midday. The daily variation of Z appeared to be
almost a time gradient curve of the daily variation of H, showing a maximum
around 09:00 LT (75° EMT) when the H field was increasing fastest and not at noon when
Δ H was the maximum. Storm time variation of H resembled the
variation of the Dst index but that of Z showed a large minimum about 2-3h
before the time of minimum Dst or at the time of maximum time gradient of
Dst variation. These features are compared with corresponding variations at
the equatorial stations Trivandrum (TRD) in India, and remarkable similarity
in all observations is noticed at PRD and TRD. It is suggested that the
observed abnormal features of Z variations at electrojet stations in
India-Sri Lanka are due to (i) direct effect of the ionospheric electrojet
current (ii) the induction effect of the image current by the average
spatially extended conductivity region and (iii) the induction current in
the local subsurface conductor. It is suggested that the conductor
responsible for the observed features in Z in India and Sri Lanka has to
have extended spatial domain to latitudes well south of India, rather than
confined to narrow Palk Strait. |
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