Sand Dunes in the Spring
NASA/JPL/University of Arizona
Sand Dunes in the Spring
ESP_025416_2640  Science Theme: Seasonal Processes
Dutch  Italian  Spanish 


720p (MP4)  
Listen to the text  


800  1024  
1152  1280  
1440  1600  
1920  2048  


PDF, 11 x 17 in  


In the winter, Martian dunes north of 70 degrees latitude are covered by a seasonal layer of carbon dioxide ice (dry ice). In the spring as the ice sublimates (goes directly from solid to gas) numerous seasonal phenomena are observed.

Mars' sand dunes are dark, but appear pinkish because they are still covered by ice. Where the ice has cracked, dark sand is visible. On the steep sides of the dunes sand slides down in thin rivulets.

Dark splotches along the crest of the dunes may be sites where gas was released in pops, similar to champagne, carrying sand out in multiple directions.

Written by: Candy Hansen   (29 February 2012)

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

 Image Products: All image links are drag & drop for HiView, or click to download
B&W: map projected  non-map

IRB color: map projected  non-map

Merged IRB: map projected

Merged RGB: map projected

RGB color: non-map projected

B&W: map-projected (592MB)

IRB color: map-projected (318MB)
B&W: map-projected  (306MB),
non-map  (252MB)

IRB color: map projected  (114MB)
non-map  (222MB)

Merged IRB: map projected  (143MB)

Merged RGB: map-projected  (141MB)

RGB color: non map-projected  (192MB)
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:28 December 2011 Local Mars time:13:07
Latitude (centered):83.986° Longitude (East):233.262°
Range to target site:317.7 km (198.5 miles)Original image scale range:31.8 cm/pixel (with 1 x 1 binning) so objects ~95 cm across are resolved
Map projected scale:25 cm/pixelMap projection:Polarstereographic
Emission angle:0.8° Phase angle:64.9°
Solar incidence angle:65°, with the Sun about 25° above the horizon Solar longitude:49.6°, Northern Spring

Context map

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: Image: NASA/JPL/University of Arizona
For information about NASA and agency programs on the Web, visit: 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.