Accession Number : AD0655775

Title :   NEW MODEL ATMOSPHERES GIVING LATITUDINAL AND SEASONAL VARIATIONS IN THE THERMOSPHERE.

Descriptive Note : Air Force surveys in geophysics no. 194,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Champion,K. S. W. ; Marcos,F. A. ; Slowey,J.

Report Date : JUN 1967

Pagination or Media Count : 35

Abstract : 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 Jacchia's 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.

Descriptors :   (*ATMOSPHERE MODELS, *IONOSPHERE), DENSITY, EXOSPHERE, ATMOSPHERIC TEMPERATURE, STANDARDS, POLAR REGIONS, DIURNAL VARIATIONS, SCIENTIFIC SATELLITES

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE