Dune Migration
NASA/JPL/University of Arizona
Dune Migration
ESP_028020_2560  Science Theme: Geologic Contacts/Stratigraphy
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This image shows large sand dunes in the North Polar sand sea on Mars. It is one of a series of repeat images of the same dunes, taken at different times, in order to determine the type and extent of changes in the dunes over time.

Dunes tend to migrate slowly on Earth under continuous wind regimes (on the order of several to tens of meters per year), and we are just starting to verify movement on Martian dunes with these repeat HiRISE images.

In addition to migration of the dune, we will also use these repeat images to look for changes in the dune shape and avalanches down the slip face. Analyzing these changes will help us better understand the interaction between the atmosphere and the surface of Mars.

Written by: Dan Berman   (15 August 2012)

This is a stereo pair with ESP_028389_2560.

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Acquisition date:18 July 2012 Local Mars time:15:05
Latitude (centered):75.963° Longitude (East):86.881°
Range to target site:324.3 km (202.7 miles)Original image scale range:32.4 cm/pixel (with 1 x 1 binning) so objects ~97 cm across are resolved
Map projected scale:25 cm/pixelMap projection:Polarstereographic
Emission angle:14.5° Phase angle:53.4°
Solar incidence angle:65°, with the Sun about 25° above the horizon Solar longitude:141.4°, Northern Summer

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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.