Frost in Dune Shadows
NASA/JPL/UArizona
Frost in Dune Shadows
ESP_034922_1385  Science Theme: Aeolian Processes
This Southern autumn image captures a view of frosty dunes. The sunlight is shining on the dunes from the upper right.

The low sun angle creates large shadows from these dunes, making for a dramatic picture. Frost is visible in the shadows of the dunes that appear as lighter or bluer swirls in each shadow. Along the illuminated section of the dunes, in the center-right of the image, five dark thin dust devil tracks are snaking their way along, parallel to the dune ridge. (North is to the left in this image, the image height covers 1.2 kilometers of the Martian surface. )

Written by: Veronica Bray (audio: Tre Gibbs)  (26 February 2014)
 
Acquisition date
07 January 2014

Local Mars time
15:20

Latitude (centered)
-41.170°

Longitude (East)
306.937°

Spacecraft altitude
253.1 km (157.3 miles)

Original image scale range
50.6 cm/pixel (with 2 x 2 binning) so objects ~152 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.3°

Phase angle
80.3°

Solar incidence angle
80°, with the Sun about 10° above the horizon

Solar longitude
73.1°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  51.1°
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   (215MB)

IRB color
map-projected   (136MB)

JP2 EXTRAS
Black and white
map-projected  (101MB)
non-map           (132MB)

IRB color
map projected  (44MB)
non-map           (119MB)

Merged IRB
map projected  (196MB)

Merged RGB
map-projected  (188MB)

RGB color
non map           (122MB)
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.