This image of a sand dune field in a southern highlands crater was acquired when the Sun was just 5 degrees above the horizon. As a result, the image is mostly shadows, with sharply-delineated dune crests sticking up into the sunlight.

The especially bright patches—bluish in enhanced color—are due to seasonal frost that is accumulating as this hemisphere approaches winter.

ID: ESP_035143_1325
date: 24 January 2014
altitude: 252 km

https://uahirise.org/hipod/ESP_035143_1325
NASA/JPL-Caltech/University of Arizona
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