Tag Archives: sand dunes

HiRISE: Dune footprints in Hellas Planitia

These curious chevron shapes in southeast Hellas Planitia are the result of a complex story of dunes, lava, and wind. Long ago, there were large crescent-shaped (barchan) dunes that moved across this area, and at some point, there was an … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , | Comments Off

HiRISE: A song of dune and ice

A song of dune and ice. This image shows rare dunes superposed on elements of the polar cap near Olympia Undae, which is a vast dune field in the north polar region of Mars. HiRISE Picture of the Day archive. … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , , | Comments Off

THEMIS: Renaudot Crater’s dunes in false color

THEMIS Image of the Day, May 31, 2019. Today’s image shows part of the floor of Renaudot Crater, located on the margin between Terra Sabaea and Utopia Planitia. The small dark blue features at the top right corner of the … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , , , , | Comments Off

THEMIS: Herschel Crater floor in false color

THEMIS Image of the Day, May 29, 2019. This false color image shows part of the floor of Herschel Crater. The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , | Comments Off

Mars sand moves under different conditions than Earth sand

Wind has shaped the face of Mars for millennia, but its exact role in piling up sand dunes, carving out rocky escarpments or filling impact craters has eluded scientists until now. In the most detailed analysis of how sands move … Continue reading

Posted in Reports | Tagged , , , , | Comments Off

THEMIS: Arabia Terra crater in false color

THEMIS Image of the Day, May 23, 2019. Today’s false color image shows part of an unnamed crater in Arabia Terra. The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , | Comments Off

The transition between sand ripples and megaripples on Mars

[Editor’s note: From a paper by James Zimbelman recently published in Icarus.] The transition between sand ripples and megaripples on Mars • HiRISE images of small sand dunes and megaripples in Gamboa and Matara craters on Mars suggest that there … Continue reading

Posted in Reports | Tagged , , , , | Comments Off

THEMIS: Inuvik Crater in false color

THEMIS Image of the Day, May 21, 2019. Today’s false-color image shows Inuvik Crater, located near the north polar cap. The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create … Continue reading

Posted in Reports | Tagged , , , , , , , , , , | Comments Off

THEMIS: Dune mound in Acidalia Planitia crater

THEMIS Image of the Day, May 17, 2019. Today’s false color image shows an unnamed crater in Acidalia Planitia. The dark blue feature on the crater floor is a mound of sand. The sand is tall enough to cast a … Continue reading

Posted in Reports | Tagged , , , , , , , , , , | Comments Off

THEMIS: Basaltic dunes on a Meridiani Planum crater floor

THEMIS Image of the Day, May 16, 2019. Today’s false color image shows an unnamed crater north of Meridiani Planum. The dark blue features are small basaltic sand dunes. The THEMIS VIS camera contains 5 filters. The data from different … Continue reading

Posted in Reports | Tagged , , , , , , , , , , , | Comments Off