Physics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982crasb.294..257b&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie II - Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Ter
Physics
Upper Atmosphere, Venus Atmosphere, Wind Velocity, Acceleration (Physics), Angular Velocity, Diurnal Variations, Mariner 10 Space Probe, Ultraviolet Photography
Scientific paper
Calculations of wind speeds in Venus' upper atmosphere are made from examinations of 15 Mariner 10 UV photographs taken over a period of 57 hr. Dark moving regions were divided into large branched and arched regions, and small, isolated spots which included irregularities outside the large dark formations. The regions measured were all near the equator and were photographed at approximately three hour intervals. Coordinates were determined in five reiterations, and movements were expressed in degrees/hour and meters/second estimates. The large dark regions were found to have characteristic movements different from smaller spots. Highest speeds, near 180 m/sec, were observed at the dawn region, and speeds averaged 111 m/sec overall, with a low point near 50 m/sec. The smaller spots were noted to increase in speed approximately 0.57 m/sec per deg between -40 and 30 deg, while the larger regions displayed an average 1.2 m/sec velocity change.
Boyer Ch.
Coupinot Gerard
Hecquet Josette
Pieplu J. L.
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