Tag Archives: active dunes

THEMIS: Kaiser Crater dunes

THEMIS Image of the Day, April 23, 2019. This VIS image shows large individual dunes on the floor of Kaiser Crater. Small dark lines to the right of the sand dunes are the tracks made by dust devils as they … Continue reading

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HiRISE: Bedrock on the floor of Kaiser Crater

HiRISE has often imaged inside Kaiser Crater to monitor active sand dunes and gullies. Surrounding these dunes, we often find clean bedrock exposures, because the actively moving sand clears off the dust. Kaiser Crater is 207 kilometers wide and was … Continue reading

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HiRISE: The hills in Juventae Chasma

This image captures some of the geologic diversity of Mars. There are hills of ancient terrains on the floor of Juventae Chasma, surrounded by younger sediments, including dark sand sheets and dunes that are likely active today. The hills are … Continue reading

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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: Sand sheet in Matara Crater

THEMIS Image of the Day, February 13, 2019. Today’s VIS image shows the sand deposit on the floor of Matara Crater. The deposit is thick enough to hide the underlying crater floor creating a sheet of sand. Upon this sheet … 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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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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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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THEMIS: Sand sheet in Halley Crater

THEMIS Image of the Day, December 24, 2018. This VIS image shows part of the dune field on the floor of Halley Crater. Rather than small individual sand dunes, the sand here is collected into a sand sheet and dune … Continue reading

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