Dune Composition
NASA/JPL/University of Arizona

Dune Composition
ESP_025042_1375  Science Theme: Aeolian Processes
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Sand dunes are among the most widespread aeolian (wind-formed) features present on Mars. Their spatial distribution and morphology are affected by changes in wind direction and wind strength. Patterns of dune erosion and deposition provide insight into the sedimentary history of the surrounding terrain.

This image shows sand dunes trapped in an impact crater in Noachis Terra. Dunes and sand ripples of various shapes and sizes, such as in this enhanced-color subimage, show the natural beauty created by physical processes.

Written by: Alfred McEwen and Ginny Gulick   (25 January 2012)

This is a stereo pair with ESP_024976_1375.

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Acquisition date:29 November 2011 Local Mars time: 2:52 PM
Latitude (centered):-42.362° Longitude (East):42.037°
Range to target site:252.2 km (157.6 miles)Original image scale range:25.2 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:0.4° Phase angle:69.9°
Solar incidence angle:69°, with the Sun about 21° above the horizon Solar longitude:36.5°, Northern Spring
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North azimuth:97° Sub-solar azimuth:50.5°
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North azimuth:270°Sub solar azimuth:224.0°

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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.