Looking for Slope Streaks
Looking for Slope Streaks
ESP_063204_1800  Science Theme: Mass Wasting Processes
Dust and sand slide down slopes on Mars in little avalanches. Dark slope streaks are thought to be the result of the relatively bright colored dust avalanching down slopes, revealing the darker, coarser sand underneath.

This image is the latest in a sequence of images of this crater that started in 2013. The goal is to watch the dusty slopes, and try to understand more about the processes that drive these little avalanches.

An animation shows this sequence of 14 images taken over seven Earth years (about 3 and a half Mars years), and shows where new streaks have occurred on the slopes of this crater. The shape of the crater’s rim appears to “wobble” because the spacecraft looks at the crater from slightly different directions. This could be corrected by creating a 3D terrain model and properly projecting each image onto it.

Written by: Ross A. Beyer (narration: Tre Gibbs)  (16 March 2020)
Acquisition date
20 January 2020

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
268.0 km (166.6 miles)

Original image scale range
54.0 cm/pixel (with 2 x 2 binning) so objects ~162 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
55°, with the Sun about 35° above the horizon

Solar longitude
138.2°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  27.0°
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   (178MB)

IRB color
map-projected   (103MB)

Black and white
map-projected  (91MB)
non-map           (94MB)

IRB color
map projected  (37MB)
non-map           (103MB)

Merged IRB
map projected  (177MB)

Merged RGB
map-projected  (162MB)

RGB color
non map           (96MB)
10K (TIFF)

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.