Physics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38..841f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 38, Aug. 1976, p. 841-846.
Physics
2
Aeronomy, Atmospheric Physics, Exosphere, Gas Dynamics, Atmospheric Density, Atmospheric Models, Atmospheric Temperature, Distribution Functions, Flow Velocity
Scientific paper
The paper develops the concept of Fahr (1971) for an exospheric velocity distribution function in the form of the sum of two functions: f0, describing just those particles that originate at the exobase and have not undergone collision in the exosphere, and f1, describing just those particles that have originated from collisions of f0-particles with the background gas in the exosphere. The distribution function is integrated and solved for f0 on the basis of exobasic distributions of densities and temperature from the OGO-6 atmospheric model. Calculations for helium show helium density and temperature having similar diurnal trends at various heights: the amplitude of the diurnal variation increases up to two earth radii of geocentric distance, and maxima and minima are shifted. At greater distances, the variation smooths out.
Fahr Hans Jörg
Paul Gerald
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