Sculpting Dunes in Ganges Chasma
Sculpting Dunes in Ganges Chasma
ESP_026100_1725  Science Theme: Aeolian Processes
When dunes are located in a complex topographical area such a canyon, they become ideal candidates for detecting changes to their shapes and sizes over time.

The dunes here in Ganges Chasma--a canyon that’s on the eastern end of Valles Marineris--could be strongly influenced by winds, and it’s important not to underestimate the erosional power of wind. Because HiRISE has such good resolution, we can track these changes over time to tell us which way a dune is moving, how much, and in what direction. From these observations we can decipher present-day atmospheric processes.

Written by: HiRISE Science Team (narration: Tre Gibbs)  (1 April 2012)
Acquisition date
20 February 2012

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
267.3 km (166.1 miles)

Original image scale range
27.8 cm/pixel (with 1 x 1 binning) so objects ~83 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
56°, with the Sun about 34° above the horizon

Solar longitude
72.9°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  42.4°
Black and white
map projected  non-map

IRB color
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Merged IRB
map projected

Merged RGB
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RGB color
non-map projected

Black and white
map-projected   (716MB)

IRB color
map-projected   (461MB)

Black and white
map-projected  (361MB)
non-map           (356MB)

IRB color
map projected  (144MB)
non-map           (332MB)

Merged IRB
map projected  (181MB)

Merged RGB
map-projected  (171MB)

RGB color
non map           (329MB)
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:

NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.