RSLs and Colorful Fans along Coprates Chasma Ridge
NASA/JPL/University of Arizona
RSLs and Colorful Fans along Coprates Chasma Ridge
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This site along a Coprates Chasma ridge shows what are called recurring slope lineae (or RSL) on generally north-facing slopes in northern summer/southern winter (latitude 12.9 degrees S, longitude 295.5 degrees E). With an animation constructed from multiple co-located images, we can detect surface change and constrain the RSL phenomena.

An enhanced color image illustrates the “greenish” fans and deposits associated with RSL. Two of these fans transition downslope into ripples. (HiRISE IRB color--near-infrared, red, and blue-green bandpasses--are displayed as red, green, and blue, respectively).

All of the lineae here and in the larger scene appear to originate from relatively bright bedrock outcrops. Some of the fans that RSL flow over became darker and brighter over time. Image is approximately 950 meters wide.

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Written by: Matthew Chojnacki   (29 January 2014)

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Acquisition date:20 October 2012 Local Mars time:15:38
Latitude (centered):-12.912° Longitude (East):295.493°
Range to target site:262.3 km (163.9 miles)Original image scale range:26.2 cm/pixel (with 1 x 1 binning) so objects ~79 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:6.0° Phase angle:60.4°
Solar incidence angle:54°, with the Sun about 36° above the horizon Solar longitude:192.1°, Northern Autumn

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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: 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.