Response of equatorial F layer vertical drift in the dusk sector to the change in the radiative output of the Sun in 1992

Details Response of equatorial F layer vertical drift in the dusk sector to the change in the radiative output of the Sun in 1992 Response of equatorial F layer vertical drift in the dusk sector to the change in the radiative output of the Sun in 1992

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.9753h&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A6, p. 9753-9757

Physics

3

Ionosphere: Equatorial Ionosphere, Ionosphere: Electric Fields, Ionosphere: Ionospheric Dynamics

Scientific paper

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.
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.

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