Quite often, HiRISE will coordinate image coverage with other science instruments to study an area of Mars in greater detail. This observation of dunes in the northern polar region of Mars called Vastitas Borealis, was coordinated with the CaSSIS instrument on the ExoMars Trace Gas Orbiter to monitor seasonal changes. The dark spots are the results of sublimating ice that exposes darker material under the top layer.

ID: ESP_076500_2545
date: 21 November 2022
altitude: 317 km

https://uahirise.org/hipod/ESP_076500_2545
NASA/JPL-Caltech/University of Arizona
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