Abstract

The results of a theoretical analysis of the radial distribution of electron temperature Te in the area of heating of the lower ionosphere by intense shortwave radiation are presented. It was established that effective radius reff of heating at a certain height may differ significantly from the characteristic radius of illumination of the ionosphere (a) by radiation at this height. At the boundary of the heating area (r = reff), the characteristic radial scale of Te changes is less than the corresponding scale of changes in the squared amplitude of the radiation electric field, and it is almost independent of the amplitude value; i.e., the formation of a relatively strong Te gradient at such a boundary is a common feature of heating of the lower ionosphere by intense shortwave radiation.

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