Seasonal Flows in Valles Marineris
NASA/JPL/University of Arizona
Seasonal Flows in Valles Marineris
ESP_049955_1665  Science Theme: Landscape Evolution


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Recurring slope lineae (RSL) are seasonal flows on warm slopes, and are especially common in central and eastern Valles Marineris. This image covers a large area full of interesting features, but the enhanced color closeup highlights some of the RSL.

Here, the RSL are active on east-facing slopes, extending from bouldery terrain and terminating on fans. Perhaps the fans themselves built up over time from the seasonal flows. Part of the fans with abundant RSL are dark, while the downhill portion of the fans are bright. The role of water in RSL activity is a matter of active debate.

Written by: Alfred McEwen (audio: Tre Gibbs)  (4 May 2017)
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Acquisition date
24 March 2017

Local Mars time:
14:05

Latitude (centered)
-13.566°

Longitude (East)
298.218°

Range to target site
262.9 km (164.3 miles)

Original image scale range
52.6 cm/pixel (with 2 x 2 binning) so objects ~158 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
0.1°

Phase angle:
31.1°

Solar incidence angle
31°, with the Sun about 59° above the horizon

Solar longitude
338.0°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  10.9°
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IRB: infrared-red-blue
RGB: red-green-blue
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Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

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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:
NASA/JPL/University of Arizona

POSTSCRIPT
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. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.