Physics
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jats...32.1060d&link_type=abstract
(NASA, State University of New York, AAS, and AGU, Conference on the Atmosphere of Venus, NASA Goddard Institute for Space Studi
Physics
14
Cloud Physics, Ultraviolet Photography, Upper Atmosphere, Venus Clouds, Astronomical Maps, Atmospheric Physics, Cloud Photography, Mariner Venus-Mercury 1973, Venus Atmosphere
Scientific paper
A large number of UV photographs taken by different observatories throughout the world are grouped for analysis. Three horizontal V, Y, or psi-shaped dark-hued cloud features are usually aligned along the equator and move 110 m/s westward in a planetary-wide rotation. The more intense and distinctly V-shaped features last several weeks. The smaller-scale cloud structures usually show significant changes after each successive rotation in 4 days around the planet. The average UV contrast is 32% but can fluctuate from disappearance to 37%. For periods of several years, the polar areas are sometimes covered by a white cloud. These polar clouds are ephemeral and usually last several weeks or months; they evolve independently for the two poles. The Mariner 10 configurations are typical of the three equatorial dark V-shaped features of similar intensities, with two white poles.
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