Abstract
Long term temperature measurements of the mesopause and lower thermosphere give a possibility to obtain altitude profiles of the mean annual temperature and to reveal a regular occurrence of the temperature maximum for heights of 85–95 km, the amplitude of which correlates with the solar activity level. Distributions with height of the atomic oxygen concentration for low and high solar activity conditions have been calculated on the basis of an empirical model of 557.7 nm emission variations and its photochemical theory. It is shown that there is the distinct correlation between an increment of the temperature and the density of the atomic oxygen. Apparently, a reaction of CO2 with O2 causes this phenomenon.
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