Cloud morphology and motions from Pioneer Venus images

Physics

Scientific paper

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Venus, Clouds, Morphology, Pvo Mission, Spacecraft Observations, Winds, Ocpp Instrument, Ultraviolet, Wavelengths, Evolution, Dynamics, Velocity, Oscillations, Comparisons, Mariner 10 Mission, Albedo, Polar Regions, Photographs, Equatorial Regions, Diagrams, Spectra, Brightness, Motion, Origin, Formation, Distribution

Scientific paper

The horizontal and vertical cloud structures, atmospheric waves, and wind velocities at the cloud top level were determined by the Pioneer Venus photopolarimeter images in the UV from January through March 1979. The images indicate long-term evolution of cloud characteristics, the atmospheric dynamics, and rapid small changes in cloud morphology. The clouds show a globally coordinated oscillation relative to latitude circles; retrograde zonal winds of 100 m/s near the equator are determined from the tracking of small-scale cloud properties, but two hemispheres show important variations. The zonal wind velocity in the southern hemisphere is reduced toward the poles at a rate similar to solid body rotation; the midlatitude jet stream noted by Mariner 10 is not observed.

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