Monte Carlo models for the terrestrial exosphere over a solar cycle

Details Monte Carlo models for the terrestrial exosphere over a solar cycle Monte Carlo models for the terrestrial exosphere over a solar cycle

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113631t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13631-13647.

Physics

40

Exosphere, Hydrogen, Monte Carlo Method, Solar Cycles, Charge Exchange, Diurnal Variations, Photoionization, Radiation Pressure, Solar Radiation, Velocity Distribution, Venus Atmosphere

Scientific paper

Improved Monte Carlo exosphere simulations for the concentration and velocity distribution of hydrogen in the terrestrial exosphere were formulated for minimum, medium, and maximum solar cycle conditions. Both the classical exobase source of hot hydrogen and the plasmaspheric source were included, along with solar radiation pressure and photoionization. It was found that at solar minimum the hydrogen from the charge exchange of hot ions in the plasmasphere exceeds that from the exobase source not only for escape but for the population at geocentric distances greater than 2 earth radii. At about two earth radii, the equivalent temperature is about 50 percent greater than that of the exobase, a situation similar to that of the 'two-temperature' Venusian exosphere. Diurnal variations were calculated for altitudes of up to 30 earth radii; for all levels of solar activity, the inclusion of radiation pressure led to a semidiurnal variation at 3-8 earth radii and a high-altitude night/day asymmetry constituting the 'geotail'.

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