Abstract
A database of the electron temperature ( T e ) comprising of most of the available LEO satellite measurements is used for studying the solar activity variations of T e . The T e data are grouped for two levels of solar activity (low LSA and high HSA), five altitude ranges between 350 and 2000 km, and day and night. By fitting a theoretical expression to the T e values we obtain variation of T e along magnetic field lines and heat flux for LSA and HSA. We have found that T e increases with increase in solar activity at low and mid-latitudes during nighttime at all altitudes studied. During daytime the T e response to solar activity depends on latitude, altitude, and season. This analysis shows existence of anti-correlation between T e and solar activity at mid-latitudes below 700 km during the equinox and winter day hours. Heat fluxes show small latitudinal dependence for daytime but substantial for nighttime.
Published Version
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