Tag Archives: sand dunes

THEMIS: Noachis crater dunes

Posted on February 8, 2019 by rburnham

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

Posted on February 6, 2019 by rburnham

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

Posted on February 6, 2019 by rburnham

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

Posted on February 5, 2019 by rburnham

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

Posted on January 31, 2019 by rburnham

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: Dunes and dust devil tracks in Terra Cimmeria

Posted on January 30, 2019 by rburnham

THEMIS Image of the Day, January 30, 2019. This unnamed crater in Terra Cimmeria has both a sand sheet with dune forms and a multitude of dust devil tracks. The linear and scalloped dark marks are created by dust devils … Continue reading →

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THEMIS: Dune patch in a Sirenum crater

Posted on January 29, 2019 by rburnham

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

Posted on January 24, 2019 by rburnham

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

Posted on January 15, 2019 by rburnham

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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THEMIS: Terra Sirenum crater dunes

Posted on January 3, 2019 by rburnham

THEMIS Image of the Day, January 3, 2019. Dark dunes fill part of the floor of this unnamed crater in Terra Sirenum. There are numerous gullies on the rim of the crater. Winds are moving the sand towards the upper … Continue reading →

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