Dunes in Late Fall: Frost in the Ripples
NASA/JPL/University of Arizona

Dunes in Late Fall: Frost in the Ripples
ESP_025679_1300  Science Theme: Aeolian Processes
French   Spanish   Portuguese   Italian   Dutch   Greek   


720p (MP4)  
Listen to the text  


800  1024  
1152  1280  
1440  1600  
1920  2048  


PDF, 11 x 17 in  


These dunes in Aonia Terra are being monitored for changes such as gullies, which form over the winter from the action of carbon dioxide frost.

The season in which this image was acquired was late fall in the Southern hemisphere. Frost is just starting to accumulate here, and is concentrated on pole-facing slopes and in the troughs between the meter-scale ripples.

The colors have been enhanced in the subimage.

Written by: Alfred McEwen   (22 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
Grayscale: map projected  non-map

IRB color: map projected  non-map

Merged IRB: map projected

Merged RGB: map projected

RGB color: non-map projected

Grayscale: map-projected (234.9 MB)

IRB color: map-projected (145.0 MB)

Grayscale: map-projected  (95.5 MB),
non-map  (153.6 MB)

IRB color: map projected  (40.3 MB)
non-map  (124.4 MB)

Merged IRB: map projected  (223.8 MB)

Merged RGB: map-projected  (213.5 MB)

RGB color: non map-projected  (122.9 MB)

Grayscale label   Color label
Merged IRB label   Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:18 January 2012 Local Mars time: 3:10 PM
Latitude (centered):-49.818° Longitude (East):293.112°
Range to target site:250.1 km (156.3 miles)Original image scale range:50.0 cm/pixel (with 2 x 2 binning) so objects ~150 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:0.3° Phase angle:82.9°
Solar incidence angle:83°, with the Sun about 7° above the horizon Solar longitude:58.6°, Northern Spring
For non-map projected products:
North azimuth:97° Sub-solar azimuth:52.2°
For map-projected products
North azimuth:270°Sub solar azimuth:223.3°

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: 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.