Dust Fans on the Seasonal Carbon Dioxide Polar Cap
NASA/JPL/University of Arizona
Dust Fans on the Seasonal Carbon Dioxide Polar Cap
PSP_003180_0945  Science Theme: Seasonal Processes


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During the long dark night of Martian winter at the South Pole, carbon dioxide in its solid form (also known as "dry ice") accumulates and forms a seasonal polar cap.

As the sun comes up in the spring, the ice evaporates in a complex way. This observation shows dark dust being blown across the seasonal south polar cap. The dust comes from the surface beneath the ice: it either starts at spots bare of ice, or it's possible that it's lofted from below the ice in geyser-like plumes.

Local winds blow the dust from its source, forming a long fan. When the wind changes direction, a new fan is formed pointing in the new direction In this single image we can see that the wind has blown in a number of directions. This data will be used to study weather patterns near the South Pole.

Written by: Candy Hansen   (28 July 2010)

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Acquisition date:01 April 2007 Local Mars time:20:08
Latitude (centered):-85.405° Longitude (East):104.073°
Range to target site:264.3 km (165.2 miles)Original image scale range:52.9 cm/pixel (with 2 x 2 binning) so objects ~159 cm across are resolved
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