Abstract

Under the assumption that the height distribution of NO does not change between summer and winter a height region was found where the neutral atmosphere density, pressure and temperature changes can significantly affect the radio-wave absorption. This is caused by the different behaviour of Lyman-α ionization with respect to other major ionization sources and by the dependence of the effective recombination coefficient on temperature. This phenomenon can qualitatively explain the regular winter increase of non-anomalous absorption ( Schwentek, 1971).

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