The dune gullies at edge of this field and here in this cutout appear active and are anomalous in their location (the high latitudes).

Tracking definitive changes will be useful in comparison with dune gully activity visible in southern mid-latitudes and the northern polar erg. The activity is thought to occur soon after the beginning of the defrosting period.

Perhaps the most striking aspect of this observation are the beautiful swirls of tracks left by dust devils. Like on Earth, dust devils move across the Martian surface, exposing the underlying darker material.

This caption is based on the original science rationale.

ID: ESP_021899_1095
date: 29 March 2011
altitude: 249 km

https://uahirise.org/hipod/ESP_021899_1095
NASA/JPL-Caltech/UArizona
#Mars #science #NASA