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The solar cycle variation of the most important parameters characterizingthe ion composition in the topside ionosphere is studied. For this purposedata from the ACTIVE mission (the IK-24 satellite) for the maximum ofsolar cycle 22 (aver F10.7~200), complemented by data available fromthe Atmosphere Explorer (AE) satellites, for the minimum of solar cycle 21(average F10.7~85), were processed. OGO-6 data from the low maximumof solar cycle 20 (average F10.7~150) were used for medium solaractivity conditions. The results for the equinox from the recently developedempirical model of ion composition are analyzed and presented, and typicalvertical profiles from solar maxima and minima are shown. It was found thatthe logarithm of the O+, H+, He+, and N+ densities inthe topside ionosphere at a fixed altitude, latitude, and local time is, inthe first approximation, a linear function of solar activity characterizedby the daily F10.7. On the other hand, the upper transition height isgenerally a non linear function of the daily F10.7, the deviation fromlinear dependence increases with latitude. Keywords. Ionosphere (Plasma temperature and density;Ion chemistry and composition; Modeling and forecasting

Manifestation of solar activity in the global topside ion composition − a study based on satellite data