Tag Archives: dunes

THEMIS: Kaiser Crater dunes

THEMIS Image of the Day, February 15, 2019. This VIS image is located in Kaiser Crater and shows several individual dunes. These dunes’ dark tone suggests they are free of dust, hence active. With continued winds sand dunes will move … Continue reading

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THEMIS: High-latitude dune field

THEMIS Image of the Day, February 14, 2019. Today’s VIS image shows a dune field on a crater floor in Terra Cimmeria. Dunes at high latitudes – near the polar caps – are affected by seasonal frost and ice. The … Continue reading

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THEMIS: Noachis crater dunes

THEMIS Image of the Day, February 8, 2019. Sand dunes cover part of the floor of this unnamed crater in Noachis Terra. Their dark tint suggests they are relatively free of light-toned dust, hence probably active under winds currently. See … Continue reading

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HiRISE: A dune field near Nili Patera

In this image many sand dunes are visible. They have an elongated crescent form and are called “barchan dunes.” They are formed by the continuous action of the wind, blowing in the same direction, giving this particular shape. The orientation … Continue reading

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THEMIS: Dune swirl in Terra Cimmeria

THEMIS Image of the Day, February 6, 2019. Sand dunes cover part of the floor of this unnamed crater in Terra Cimmeria. See more THEMIS Images of the Day by geological subject.

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THEMIS: Sea of dunes in Rabe Crater

THEMIS Image of the Day, February 5, 2019. This VIS image shows part of the floor of Rabe Crater. The floor of Rabe Crater has undergone several surface changing events. At some point after the crater was formed it was … Continue reading

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HiRISE: Landforms northwest of Herschel Crater

Landforms northwest of Herschel Crater. Herschel Crater is a 304 kilometer impact basin in the Martian Southern Hemisphere. We have imaged the crater enough times to learn that dunes here are not stationary but move over time. The crater is … Continue reading

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THEMIS: Dune patch in a Sirenum crater

THEMIS Image of the Day, January 29, 2019. A field of sand dunes is visible on the floor of this unnamed crater. The crater is located in Terra Sirenum. See more THEMIS Images of the Day by geological subject.

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HiRISE: A first look at dunes

This image shows us a cross-section of a dune field. Dune shape depends on several factors, including the amount of sand present and the local wind directions. This dune field displays several distinct dune morphologies. We see both individual barchan-like … Continue reading

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HiRISE: The source of dunes in Chasma Boreale

The source of dunes in Chasma Boreale. This image shows dunes during the summer, when they were free from the seasonal layer of carbon dioxide ice that covers the region for much of the year. These dunes, which are near … Continue reading

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