Physics
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..705a&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 42, Aug. 1980, p. 705-716.
Physics
7
Airglow, Atmospheric Composition, Atmospheric Models, Atmospheric Tides, Oxygen Afterglow, Thermosphere, Turbulent Mixing, Atmospheric Chemistry, Atmospheric Circulation, Photochemical Reactions, Time Dependence, Vertical Air Currents
Scientific paper
The influence of turbulent mixing, vertical motions and atmospheric tides on the densities of N2, O and O2 in the lower thermosphere is investigated for a one-dimensional time-dependent diffusive-photochemical model. For large and small values of fluxes of solar radiation which dissociates O2, an attempt is made to account for seasonal-latitudinal dependences of forbidden O/forbidden N2 at the height of 120 km which are given in empirical air composition models obtained for different levels of solar activity from measurements on the OGO-6 and ESRO-4 satellites. The agreement between the calculations and observations requires, in the atmospheric layer near 100 km, the existence of air circulation with upward motions in the summer hemisphere and downward motions in the winter hemisphere. With a small solar radiation flux, the agreement between the one-dimensional model calculations and the OGO-6 empirical model is impossible; it appears to be possible with the ESRO-4 model only if turbulent transfer is neglected. It is possible that there is a strong 'mixing' effect of the low-latitude diurnal tide causing a considerable decrease in forbidden O in the lower thermosphere. Models of tidal oscillations of the forbidden O I 5577 A emission intensity are constructed.
Akmaev Rashid A.
Shved Gustav M.
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