Tag Archives: basaltic sand

THEMIS: Active dune field in Noachis

THEMIS Image of the Day, December 13, 2018. Today’s VIS image shows sand dunes on the floor of an unnamed crater in Noachis Terra. These dunes are likely active because they are dark, indicating that they move often enough to … Continue reading

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THEMIS: Halley Crater dunes

THEMIS Image of the Day, December 6, 2018. Halley Crater is located on the western side of Argyre Planitia. Sand dunes cover part of the crater floor. The dunes’ dark tone indicates they are free from dust. This in turn … Continue reading

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HiRISE: Active dunes in Wirtz Crater

These gorgeous dunes are likely active, with ripples on their upwind slopes and dark streaks on their downwind slopes forming and changing due to wind-driven sand motion. This motion will also keep the dune brink (the edge between the two … Continue reading

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THEMIS: Active dunes in Noachis Terra

THEMIS Image of the Day, November 28, 2018. Today’s VIS image shows a sand sheet with surface dunes forms on the floor of an unnamed crater in Noachis Terra. Dark dunes indicate active dunes: Winds stir the sand, which kicks … Continue reading

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THEMIS: Dunes in Kaiser Crater

THEMIS Image of the Day, November 23, 2018. This VIS image shows part of the floor of Kaiser Crater, including several sand dunes. Kaiser Crater is located in Noachis Terra. The dunes’ dark tone indicates they are free of dust, … Continue reading

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Volcanic ash: Major source of Mars dust?

[Editor’s note: From a paper by Charlie Bristow and Torsten Moller, recently published in the Journal of Geophysical Research.] Dust Production by Abrasion of Eolian Basalt Sands: Analogue for Martian Dust • Collisions between particles and surfaces during eolian abrasion … Continue reading

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THEMIS: Trouvelot Crater in false color

THEMIS Image of the Day, October 12, 2018. This VIS image shows Trouvelot Crater and a smaller crater on its floor. Dark blue tones in this version of color combination is often dark basaltic sands. The THEMIS VIS camera contains … Continue reading

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THEMIS: Sands of Tombaugh Crater

THEMIS Image of the Day, September 26, 2018. Tombaugh Crater is in the center of this VIS image. Dark blue tones are basaltic sands of the floor of the crater. The THEMIS VIS camera contains 5 filters. The data from … Continue reading

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THEMIS: Arabia Terra landscape in false color

THEMIS Image of the Day, September 24, 2018. Today’s VIS image shows part of Arabia Terra. The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. … Continue reading

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THEMIS: Nepenthes Mensae in false color

THEMIS Image of the Day, September 20, 2018. Nepenthes Mensae is the region of hills and mesas north of Terra Cimmeria. The dark blue part of the image is a region of basaltic sands. The THEMIS VIS camera contains 5 … Continue reading

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