The atmosphere between 74 and 160 km is pictured as being composed of three rather distinct regions which are characterized by ‘globular,’ ‘cylindrical,’ and ‘spherical’ diffusion as applied to the growth of an initially spherical cloud. These regions are below 110 km, from 110 to 120 km, and above 120 km, respectively. Horizontal wind velocities for the region between 74 and 160 km above the Air Force Eglin Gulf Test Range, Florida, were computed from data obtained during 12 rocket flights in 1959 and 1960. Curves are presented to show the speed and direction of horizontal winds as a function of altitude. Detailed studies have been made of data obtained from three rocket flights in the ‘globular’ region between 97 and 111 km. Curves are presented to show both horizontal and vertical wind speeds.
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