Tag Archives: sand dunes

THEMIS: Slopes and dunes of Sisyphi Cavi

THEMIS Image of the Day, May 2, 2019. This VIS image shows part of Sisyphi Cavi located in Noachis Terra near the south polar cap. Cavi are defined as steep sided depressions. Gullies dissect the cliff tops and dunes are … Continue reading

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HiRISE: Megadunes in Hyperborei Cavi

Megadunes in Hyperborei Cavi. A cavus is an irregular steep-sided depression usually in arrays or clusters. Plus: MEGADUNES! HiRISE Picture of the Day archive. [More at links]

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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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THEMIS: Sand sheet, dunes in Matara Crater

THEMIS Image of the Day, April 22, 2019. Today’s VIS image shows the floor of Matara Crater. A large sand sheet with surface dune forms dominates the floor of this crater located in Noachis Terra. The dunes’ dark tone indicates … 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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THEMIS: Arabia Terra crater dunes

THEMIS Image of the Day, April 15, 2019. Today’s VIS image is located in an unnamed crater in Arabia Terra. Dark blue in this combination is typically basaltic sands. The presence of sand dunes with this tone indicated that these … Continue reading

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HiRISE: Dunes in low southern latitudes

Dunes in low southern latitudes. The objective of this observation is to examine a small field of dunes. HiRISE Picture of the Day archive. [More at links]

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THEMIS: Sand dunes and sheets in Arabia Terra

THEMIS Image of the Day, April 10, 2019. This false-color VIS image is located in an unnamed crater in Arabia Terra. Dark blue tones in false color indicate basaltic sands. These sands have created the dunes seen in this image, … Continue reading

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THEMIS: Syrtis Major Planum in false color

THEMIS Image of the Day, April 5, 2019. This false-color VIS image is located in the center of Syrtis Major Planum. At the top of the image is Nili Patera, a volcanic summit. The sand dunes located near Nili Patera … Continue reading

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HiRISE: Frost-covered dunes

Frost-covered dunes. Sprinkled with hopes and dreams, no less. This is a relatively new monitoring site that seems to have heavy carbon-dioxide snowfall. HiRISE Picture of the Day archive [More at links]

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