Abstract
Upper air densities obtained by means of rockets and satellites in the region from 100 km to about 800 km are presented. Variations of densities from day to night become apparent around 200 ± 30 km; the effect increases with altitude. Pressures and scale heights are derived from densities, and preliminary mean values for day and night are obtained. From the variation of scale height with altitude, regions of constant temperature and of variable molecular weight have been determined. It has been found that the mean temperature at 300 ± 50 km is approximately 1400°K. Shortly after midnight, the temperature drops to about 1010°K, and stays approximately constant above 160 ± 10 km.
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