Dune Symmetry
NASA/JPL/University of Arizona
Dune Symmetry
ESP_016036_1370  Science Theme: Aeolian Processes
Italian  Spanish 


800  1024  
1152  1280  
1440  1600  
1920  2048  


PDF, 11 x 17 in  
Dunes of sand-sized materials have been trapped on the floors of many Martian craters. This is one example, from a crater in Noachis Terra, west of the giant Hellas impact basin.

The dunes here are linear, thought to be due to shifting wind directions. In places, each dune is remarkably similar to adjacent dunes, including a reddish (or dust colored) band on northeast-facing slopes. Large angular boulders litter the floor between dunes.

The most extensive linear dune fields know in the Solar System are on Saturn's large moon Titan. Titan has a very different environment and composition, so at meter-scale resolution they probably are very different from Martian dunes.

Written by: Alfred McEwen   (13 January 2010)

Click to share this post on Twitter Click to share this post on Facebook Click to share this post on Google+ Click to share this post on Tumblr

Acquisition date
28 December 2009

Local Mars time:

Latitude (centered)

Longitude (East)

Range to target site
254.8 km (159.3 miles)

Original image scale range
25.5 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle:

Phase angle:

Solar incidence angle
67°, with the Sun about 23° above the horizon

Solar longitude
29.8°, Northern Spring

North azimuth:

Sub-solar azimuth:
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

Black and white
map-projected   (1187MB)

IRB color
map-projected   (530MB)

Black and white
map-projected  (539MB)
non-map           (732MB)

IRB color
map projected  (223MB)
non-map           (535MB)

Merged IRB
map projected  (299MB)

Merged RGB
map-projected  (288MB)

RGB color
non map           (542MB)
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/JPL/University of Arizona

For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. 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. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.