Tag Archives: north polar sand sea

THEMIS: North polar dunes meet Escorial Crater

THEMIS Image of the Day, September 25, 2018. At the bottom of this image is Escorial Crater. The dune field to the north are called Hyperboreae Undae. The subtle blue and yellow arcs over the crater are clouds. The THEMIS … Continue reading

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HiRISE: The other Pan’s labyrinth

The other Pan’s labyrinth. These polar dunes are located near source of gypsum. Beautiful Mars series. [More at links]

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THEMIS: Dunes and Escorial Crater ejecta in false color

THEMIS Image of the Day, September 13, 2018. The ‘brown’ in this VIS image is part of the ejecta surrounding Escorial Crater. The material of the ejecta blanket is much more resistant to local winds and remains as a plateau … Continue reading

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THEMIS: Siton Undae dunes in false color

THEMIS Image of the Day, September 12, 2018. The blue features in this VIS image are sand dunes located near Escorial Crater and the north polar cap. The dune field is called Siton Undae. The THEMIS VIS camera contains 5 … Continue reading

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THEMIS: On the shore of a sea of sand

THEMIS Image of the Day, June 20, 2018. This VIS image shows a small part of the huge northern dune field called Olympia Undae. This dune field surrounds 1/3 of the north polar cap. Collected in northern summer, there is … Continue reading

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HiRISE: Of dunes and their stories

Of dunes and their stories. So far no seasonal changes have been detected here, making this site unique. Beautiful Mars series. [More at links]

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HiRISE: Corduroy dunes

Corduroy dunes. The permanent polar cap of Mars is encircled by sand dunes and looking like pulled threads, these dunes march across a fabric of patterned ground. At this time of the Martian year they are free of the seasonal … Continue reading

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HiRISE: Patches of snow

The North Pole of Mars is surrounded by a vast sea of sand dunes. In this dune field, the dunes are covered by a seasonal cap of dry ice in the winter. In early Martian summer, at the time we … Continue reading

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THEMIS: Frost-free dunes in the north polar sand sea

THEMIS Image of the Day, May 25, 2018. This VIS image shows part of Olympia Undae, a large dune field that surrounds part of the north polar cap. At the top of the image the dunes are small and isolated. … Continue reading

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HiRISE: Dune erosion and streaks

Dune erosion and streaks. One of the many seasonal images we take to detect changes. In this case, we want to quantify the process of erosion driven by sublimation on the dunes. (Sublimation is the process of going directly from … Continue reading

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