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Title: | Response of equatorial F layer vertical drift in the dusk sector to the change in the radiative output of the Sun in 1992 |
Authors: | Sastri, J. H |
Keywords: | Ionosphere: Equatorial Ionosphere Ionosphere: Electric Fields Ionosphere: Ionospheric Dynamics |
Issue Date: | Jun-1995 |
Publisher: | American Geophysical Union |
Citation: | Journal of Geophysical Research-Space Physics, Vol. 100, No. A 6, pp. 9753 - 9757 |
Abstract: | A study is made of the effect of the rapid and large decline in the solar radiative output that occurred from March through May 1992 on the postsunset maximum in F layer vertical drift Vzp over Kodaikanal (dip 3°N). Between the periods July 1991 through February 1992 and June 1992 through February 1993, there is a 35% decrease in the mean amplitude of the postsunset peak in F layer vertical drift (Vzp) over Kodaikanal, corresponding to the 40% decrease in the mean level of the 10.7-cm solar radio flux.<p>Changes of the same magnitude are also seen when the comparison is restricted to a shorter interval of two local winter months preceding and following the rapid decline in the 10.7-cm flux. The results illustrate the sensitivity of equatorial F layer vertical drift in the dusk sector to short-term variability in the solar radiative output. Solar flux related changes in the longitudinal (local time) gradient in E region conductivity as well as in the F region zonal winds are suggested as the cause of the positive response of the dusktime peak in F layer vertical drift to the rapid decline in solar radiative output that occurred in early 1992. |
Description: | Open Access |
URI: | http://hdl.handle.net/2248/3036 |
ISSN: | 0148-0227 |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Response of equatorial F layer vertical drift | Open Access | 311.31 kB | Adobe PDF | ![]() View/Open |
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