Abstract
The work of Hanson and Patterson on the solution of the time dependent equation describing the diurnal variation of the concentration of atomic hydrogen at the base of the exosphere has been extended to properly include the effects of lateral flow of the gas around the Earth. It is shown that the lateral flow has a very important influence on the day-night asymmetry in the hydrogen concentration. The mean concentration is controlled by the escape flux. For the two temperature models considered varying sinusoidally from 700°K to 1000°K and from 1000°K to 1500°K the ratios of the maximum nighttime to the minimum daytime concentration of hydrogen at the base of the exosphere are found to be 1.8 and 2.6 respectively.
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