RSLs and Colorful Fans along Coprates Chasma Ridge
RSLs and Colorful Fans along Coprates Chasma Ridge
ESP_029226_1670  Science Theme: Mass Wasting Processes
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. 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 infrared-red-blue is 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.

Written by: Matthew Chojnacki  (29 January 2014)
Acquisition date
20 October 2012

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
262.0 km (162.8 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 up

Map projection

Emission angle

Phase angle

Solar incidence angle
54°, with the Sun about 36° above the horizon

Solar longitude
192.1°, Northern Autumn

For non-map projected images
North azimuth:  98°
Sub-solar azimuth:  8.0°
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

Black and white
map-projected   (294MB)

IRB color
map-projected   (172MB)

Black and white
map-projected  (128MB)
non-map           (171MB)

IRB color
map projected  (39MB)
non-map           (143MB)

Merged IRB
map projected  (70MB)

Merged RGB
map-projected  (65MB)

RGB color
non map           (142MB)
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

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’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.