Dunes in Late Fall: Frost in the Ripples
NASA/JPL/University of Arizona
Dunes in Late Fall: Frost in the Ripples
ESP_025679_1300  Science Theme: Aeolian Processes
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These dunes in Aonia Terra are being monitored for changes such as gullies, which form over the winter from the action of carbon dioxide frost.

The season in which this image was acquired was late fall in the Southern hemisphere. Frost is just starting to accumulate here, and is concentrated on pole-facing slopes and in the troughs between the meter-scale ripples.

The colors have been enhanced in the subimage.

Written by: Alfred McEwen   (22 February 2012)

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Acquisition date:18 January 2012 Local Mars time:15:10
Latitude (centered):-49.818° Longitude (East):293.112°
Range to target site:250.1 km (156.3 miles)Original image scale range:50.0 cm/pixel (with 2 x 2 binning) so objects ~150 cm across are resolved
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Emission angle:0.3° Phase angle:82.9°
Solar incidence angle:83°, with the Sun about 7° above the horizon Solar longitude:58.6°, Northern Spring

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