Mysterious Bright and Dark Slope Streaks in Arabia Terra
NASA/JPL/UArizona
Mysterious Bright and Dark Slope Streaks in Arabia Terra
PSP_007162_1915  Science Theme: Mass Wasting Processes
This observation is of region between large craters in Arabia Terra, which is a large swath of bright (high albedo) terrain in the Martian cratered uplands.

At the center of this image is a channel with a sinuous, fluvial-like (river-like) morphology, although it has long since been dry. The floor of the channel is covered with an array of linear dunes, which are accumulations of windblown sediment.

Of special interest in this scene is a series of dark (low albedo) and brighter (higher albedo) discolorations along the channel walls, also known as slope streaks. Most slope streaks are initially dark, gradually brighten with time, and are thought to be due to dust avalanches that remove a thin layer of bright dust to reveal darker material. Here, many streaks appear brighter than the surrounding undisturbed slope surface, and the origin of these bright streaks is not entirely clear.

In this subimage, it is apparent that dark streak always appear to be on top of the bright streaks, indicating that the dark streaks are younger.

Written by: Brad Thomson  (19 March 2008)
 
Acquisition date
05 February 2008

Local Mars time
14:38

Latitude (centered)
11.284°

Longitude (East)
31.953°

Spacecraft altitude
276.3 km (171.7 miles)

Original image scale range
27.8 cm/pixel (with 1 x 1 binning) so objects ~83 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
8.0°

Phase angle
46.7°

Solar incidence angle
39°, with the Sun about 51° above the horizon

Solar longitude
27.7°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  9.8°
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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.