Night-time F-region and daytime E-region ionospheric drifts measured at Udaipur during solar flares
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 d...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2002-11-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/20/1837/2002/angeo-20-1837-2002.pdf |
| Summary: | 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.<br><br><b>Key words. </b>Ionosphere (electric fields and currents;
ionospheric disturbances) |
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| ISSN: | 0992-7689 1432-0576 |