Solar Photoabsorption and Thermal Processes in the Polar Thermosphere.
Rept. for Jul 70-Jun 71,
AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS
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The report reviews a number of physical processes that occur in the thermosphere and significantly affect its neutral state through the deposition or loss of thermal energy and by modification of its composition. Specifically, the processes discussed are 1 thermal heating from absorbed solar radiation in the wavelength region below 2400 A, 2 photodissociation of O2, 3 thermal heating from atomic oxygen recombination, and 4 cooling by infrared emission of atomic oxygen. Basic concepts associated with the calculation of the various processes are discussed in detail, and most recent data on relevant physical parameters are reviewed. Numerical models of the heating, dissociation, and cooling are presented on the basis of a nominal atmospheric model. Special emphasis is placed on diurnal, seasonal, and latitudinal variations. Author
- Atmospheric Physics