Venus - Further evidence of vortex circulation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atmospheric Circulation, Venus Atmosphere, Venus Clouds, Vortices, Cloud Cover, Mariner 10 Space Probe, Polar Regions, Spaceborne Astronomy, Stereophotography, Stratus Clouds, Ultraviolet Photography, Venus, Mariner 10, Stereophotography, Ultraviolet, Vortex, Clouds, Imagery, Atmospheric Circulation, Polar Regions, Motion

Scientific paper

A space-time composite of polar stereographic ultraviolet images of Venus from Mariner 10 shows a remarkable circumpolar vortex. The vortex is characterized by a cloud which appears similar to dense terrestrial stratus having an albedo that is 50 percent higher. Spiral streaks converge into it from low latitudes, akin to the spiral bands of a hurricane. The bright visible polar cloud is not axisymmetric but has roughly an elliptical shape. The high brightness of the polar cloud suggests that it has a different origin from the rest of the Venus cloud cover.

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