Abstract
We analyze the behavior of the ionospheric D region during sunset and sunrise using the results of measurements performed in August 2000 at the “Sura” facility by the method of artificial periodic inhomogeneities. The measured altitude profiles of the relaxation time and the scattered-signal amplitude are interpreted within the framework of a model with single negative-ion species O2-. Variations in the number densities of atomic and excited molecular oxygen and the altitude profiles of the electron density are found.
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