NEW MODEL ATMOSPHERES GIVING LATITUDINAL AND SEASONAL VARIATIONS IN THE THERMOSPHERE.
Air Force surveys in geophysics no. 194,
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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A set of model atmospheres was prepared which constitutes a major advance in the representation of systematic variations in atmospheric properties between 120 and 250 km. The new models have three sets of boundary conditions at 120 km, which represent idealized variations with season and latitude, and connect with the new low altitude models which are a function of season and latitude. The three sets of high altitude models merge into one set above about 250 km. This set is identical with Jacchias latest models and is a function of the usual parameters, including time of day, solar flux and geomagnetic index. The new models appear to be in reasonable agreement with available experimental data. The theory predicts variations in the number densities of the individual constituents. An unexpected result is the prediction that the ratios of the constituents such as O to O2 also vary, even at the boundary altitude.
- Atmospheric Physics