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| Titel |
Night-time F-region and daytime E-region ionospheric drifts measured at Udaipur during solar flares |
| VerfasserIn |
B. M. Vyas, 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 ; 20, no. 11 ; Nr. 20, no. 11, S.1837-1842 |
| Datensatznummer |
250014497
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| Publikation (Nr.) |
 copernicus.org/angeo-20-1837-2002.pdf |
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| Zusammenfassung |
Ionospheric drifts
measured at a low latitude station, Udaipur (Geomag. Lat. 14.5° N), in the
night-time F-region and daytime E-region during solar flares have been studied.
The night-time observations, which correspond to the F-region drifts, were
carried out on five different nights. The daytime observation corresponding to
the E-region drifts is only for one day. It is found that the apparent drift
during the solar flare period is reduced considerably, in the daytime E-region
as well as in the night-time F-region. The East-West and North-South components
of the apparent drift speed are also similarly affected. For the daytime
E-region drifts during a flare, increased ionization and subsequent reduction
of reflection height is proposed to be the cause of reduced drift speeds. For
the night-time F-region drifts, a reduced electric field at the F-region
heights resulting from coupling of sunlit and dark hemispheres has been
proposed to be the possible cause.
Key words. Ionosphere (electric fields and currents;
ionospheric disturbances) |
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