The rationale for this observation is simple: to look for seasonal changes and frost monitoring. This stunning dune field, almost 5 km (3 mi) across in the grayscale cutout, is located at the bottom of an unnamed impact crater. The dark spots are the result of sublimation, that exposes the darker subsurface when a solid transforms directly into a gaseous state and disturbs the topside.

ID: ESP_077332_2420
date: 25 January 2023
altitude: 312 km

https://uahirise.org/hipod/ESP_077332_2420
NASA/JPL-Caltech/University of Arizona
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