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Ainsworth & Herman 1975
Ainsworth, J.E. and Herman, J.R. (1975). Venus wind and temperature structure: The venera 8 data. Journal of Geophysical Research 80: doi: 10.1029/JA080i001p00173. issn: 0148-0227.

Our analysis of the Venera 8 measurements yields equatorial morning terminator horizontal and vertical winds that are similar in a number of respects to the winds we obtained from our analysis of the Venera 7 measurements. The lower boundary of the horizontal retrograde '4-day' wind is defined by a 50-60% decrease in wind speed in the vicinity of 44 km, and there exists a retrograde wind 'plateau' of 15- to 40-m/s winds extending from 40 km down to the vicinity of 18 km, where the winds decrease rapidly to the order of 0.1 m/s near the surface. Updrafts of 2-5 m/s exist in the vicinity of 20-30 km and are apparently associated with a slightly superadiabatic lapse rate.

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Journal
Journal of Geophysical Research
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American Geophysical Union
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