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Solar activity e€ects in the ionospheric D region*

By A. D. Danilov


Abstract. Variations in the D-region electron concentration within the solar activity cycle are considered. It is demonstrated that conclusions of various authors, who have analyzed various sets of experimental data on [e], di€er signi®cantly. The most reliable seem to be the conclusions based on analysis of the [e] measurements carried out by the Faraday rotation method and on the theoretical concepts on the D-region photochemistry. Possible QBO e€ects in the relation of [e] to solar activity are considered and an assumption is made that such e€ects may be the reason for the aforementioned disagreement in conclusions on the [e] relation to solar indices. Key words. Atmospheric composition and structure á Ion chemistry of the atmosphere á Middle atmosphere

Year: 2013
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