These apparent mounds on the residual polar ice cap have unusually high thermal inertia, which is a measure of the subsurface’s ability to store heat during the day and re-radiate it during the night. These may be ice-covered dunes, but it is unclear.

ID: ESP_062344_2620
date: 14 November 2019
altitude: 319 km

https://uahirise.org/hipod/ESP_062344_2620
NASA/JPL-Caltech/University of Arizona
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