We have analyzed daytime composition measurements in the thermosphere from Atmosphere Explorer-C by use of a theory of the ion chemistry. We compare predicted and measured N2+ densities in order to infer global variations of the solar ionizing flux. Our results indicate that the solar flux of Hinteregger measured on Atmosphere Explorer-C provides an adequate basis for the calculation of solar ultraviolet photo-ionization rates. The role of metastable species is examined, and theoretical O+(²D) densities are presented.
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Oppenheimer et al. (1976) studied this question.
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