Satellite measurements of ion composition and temperatures in the topside ionosphere during medium solar activity

Physics

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Ion Concentration, Ion Temperature, Ionospheric Composition, Satellite Observation, Solar Activity Effects, Upper Ionosphere, Atmospheric Models, Electron Energy, Explorer 31 Satellite, Ionic Diffusion, Midlatitude Atmosphere, Ogo-4, Vertical Distribution

Scientific paper

Information on both ion density and temperature is obtained from analysis of Retarding Potential Analyzer data from the OGO-4 and Explorer-31 satellites. Results obtained from data in the altitude range of 700-2000 km during medium solar activity are presented. An attempt is made to describe the major altitude variations of ion densities and temperatures at middle and low latitudes. The transition heights, where the heavier and lighter ions are equal, are found to be about 1600 and 1300 km at middle and low latitudes, respectively, for daytime and 700 km at night for middle latitudes. Based on the observed data and using diffusive equilibrium as a first-order approximation, topside ionospheric composition models are given for medium solar activity.

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