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- W2055126229 abstract "Abstract From June through September 1970, ultraviolet photographs of Venus, many of very high quality, were obtained by the International Planetary Patrol Program. A study of these photographs, together with some from other observatories, confirms previous reports that there is a retrograde circulation of the upper atmosphere of Venus. The sense of the rotation and its approximate period are determined from the motions of well-defined cloud features on five occasions over intervals of several hours. A distinctive feature similar to the “Y” described by Boyer and Guerin is seen many times over a forty-day interval (June 21 to August 1) and allows a good determination of the rotation period: 4.41 ± 0.02 days retrograde (synodic) or 4.50 days (sidereal). This value differs significantly from other estimates, but applies only to this particular forty-day interval. Apparent changes in the cloud features may be an indication that the circulation of the upper atmosphere of Venus is a complicated, time-dependent phenomenon. A temporal variation of the rotation period (caused perhaps by slight changes in the altitude of the ultraviolet cloud layer) is conceivable, so that exact agreement with other estimates of the period obtained at different times is not necessarily to be expected. Measurements of the latitude variation of the “Y” feature are too few and too uncertain to reveal systematic trends, although a large range (20°) in central latitude is indicated. The previous suggestion that a higher cloud layer may occasionally obscure the ultraviolet markings is consistent with the present observations." @default.
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- W2055126229 date "1972-12-01" @default.
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- W2055126229 title "Retrograde rotation of the upper atmosphere of Venus" @default.
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- W2055126229 doi "https://doi.org/10.1016/0019-1035(72)90027-9" @default.
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