HiRISE is also a big fan of polar dunes! We acquired this image as a site for long term monitoring for any changes. On some of the ridges, frost is visible as well as dark spots caused by the process of sublimation that exposes the darker subsurface and will fade over time.

ID: ESP_076794_2605
date: 14 December 2022
altitude: 314 km

https://uahirise.org/hipod/ESP_076794_2605
NASA/JPL-Caltech/University of Arizona
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