Dunes and Dust Devils
NASA/JPL/UArizona
Dunes and Dust Devils
ESP_021641_1205  Science Theme: Seasonal Processes
Craters trap wind-blown sand very effectively. In the Southern Hemisphere we see fields of sand dunes on the floors of many craters.

Longitudinal dunes cross a portion of the floor of this un-named Southern hemisphere crater. Dust devil tracks that criss-cross the dunes remove a light layer of dust but do not disturb the ripples on the dunes. In the cutout large boulders appear partially buried by the drifting sand.

Written by: Candy Hansen  (14 March 2011)
 
Acquisition date
09 March 2011

Local Mars time
15:22

Latitude (centered)
-58.981°

Longitude (East)
16.798°

Spacecraft altitude
251.5 km (156.3 miles)

Original image scale range
50.3 cm/pixel (with 2 x 2 binning) so objects ~151 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.9°

Phase angle
50.8°

Solar incidence angle
50°, with the Sun about 40° above the horizon

Solar longitude
251.2°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  28.5°
JPEG
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

JP2
Black and white
map-projected   (194MB)

IRB color
map-projected   (90MB)

JP2 EXTRAS
Black and white
map-projected  (74MB)
non-map           (125MB)

IRB color
map projected  (26MB)
non-map           (108MB)

Merged IRB
map projected  (195MB)

Merged RGB
map-projected  (183MB)

RGB color
non map           (103MB)
ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products
HiView

NB
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

USAGE POLICY
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

POSTSCRIPT
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.