Tag Archives: barchan dunes

HRSC: Colorful dunes on wind-swept Mars

Dunes are prominent indicators of prevailing winds, as can be seen on this crater floor on Mars, imaged by ESA’s Mars Express on 16 May. Depressions such as impact craters can act as traps for sediments that have been blown … Continue reading

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HiRISE: Opposing dunes, opposing winds

On one side of this image, fairly textbook-looking barchan sand dunes sit atop the bedrock. Barchan dunes pointing in the opposite direction are just a few kilometers away to the east. In between these opposing barchan dunes are star dunes. … Continue reading

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HiRISE: Dunes of the Southern Highlands

Sand dunes are scattered across Mars and one of the larger populations exists in the Southern hemisphere, just west of the Hellas impact basin. The Hellespontus region features numerous collections of dark, dune formations that collect both within depressions such … Continue reading

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HiRISE: Barchan dune changes

Barchan dune changes in the Hellespontus region. Beautiful Mars series.

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HiRISE: Dunes in northern summer

This dune field formed near the base of the North Polar cap. Dunes require a source of loose particulate material to form. The source of the northern dune fields around the polar cap may be from the layers of dusty … Continue reading

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HiRISE: Changing dunes of Wirtz Crater

The large dark feature is a classic Martian sand dune. Most sand on Earth is made from the mineral quartz, which is white and bright. On Mars, most sand is composed of dark basalt, a volcanic rock. For this reason, … Continue reading

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HiRISE: Barchan dunes

Consider the barchan dune. Beautiful Mars series.

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HiRISE: Barchan dunes, Dulovo Crater region

Barchan dunes in the Dulovo Crater region. Beautiful Mars series.

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HiRISE: Martian Morse code

These dark dunes are influenced by local topography. The shape and orientation of dunes can usually tell us about wind direction, but in this image, the dune-forms are very complex, so it’s difficult to know the wind direction. However, a … Continue reading

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HiRISE: Summer sand dunes

Mars’ permanent North Polar cap is ringed by sand dunes. In the winter and spring the dunes are covered by a seasonal cap of dry ice. Here, we see the dark dunes in the summer, bare of seasonal frost. Two … Continue reading

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