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Ann. Geophys., 23, 2511-2517, 2005
www.ann-geophys.net/23/2511/2005/
© European Geosciences Union 2005
Manifestation of solar activity in the global topside ion composition − a study based on satellite data
V. Truhlík, L. Trísková, and J. Šmilauer
Institute of Atmospheric Physics, Acad. Sci. Czech Rep., BočníII., 14131 Praha 4-Sporilov, Czech Republic
Abstract. The solar cycle variation of the most important parameters characterizing
the ion composition in the topside ionosphere is studied. For this purpose
data from the ACTIVE mission (the IK-24 satellite) for the maximum of
solar cycle 22 (aver F10.7~200), complemented by data available from
the Atmosphere Explorer (AE) satellites, for the minimum of solar cycle 21
(average F10.7~85), were processed. OGO-6 data from the low maximum
of solar cycle 20 (average F10.7~150) were used for medium solar
activity conditions. The results for the equinox from the recently developed
empirical model of ion composition are analyzed and presented, and typical
vertical profiles from solar maxima and minima are shown. It was found that
the logarithm of the O+, H+, He+, and N+ densities in
the topside ionosphere at a fixed altitude, latitude, and local time is, in
the first approximation, a linear function of solar activity characterized
by the daily F10.7. On the other hand, the upper transition height is
generally a non linear function of the daily F10.7, the deviation from
linear dependence increases with latitude.
Keywords. Ionosphere (Plasma temperature and density;
Ion chemistry and composition; Modeling and forecasting)
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