The giant sand dunes in Kaiser Crater experience gully erosion of the steep slip faces every year in late winter as the sun warms these slopes and seasonal carbon dioxide frost sublimates (meaning it changes from a solid to gas).

Some of these gullies produce a variety of colors that are highlighted on the west-facing (illuminated) slopes, where the gullies appear to be glowing in the winter light.

ID: ESP_045324_1325
date: 28 March 2016
altitude: 251 km

https://uahirise.org/hipod/ESP_045324_1325
NASA/JPL-Caltech/University of Arizona
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