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Last updated on April 17, 2014 at 17:30 EDT
Proctor Crater Dunes Revisited
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Proctor Crater Dunes Revisited

February 20, 2009
In the winter the dunes in Proctor Crater are covered with seasonal carbon dioxide frost (dry ice). In the spring, the frost gradually evaporates but lingers in protected regions. In this color image bright ice deposits in sheltered areas highlight the ripples on the dunes.

These dunes were imaged during the first year of MRO's mission. Images taken now in the second Martian spring can be compared to the previous year to study interannual variability.