Field of Transverse Aeolian Ridges in Proctor Crater
NASA/JPL/University of Arizona
Field of Transverse Aeolian Ridges in Proctor Crater
ESP_024449_1320  Science Theme: Aeolian Processes
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Transverse Aeolian Ridges (or TARs) are small aeolian bedforms that are distinct from typical dunes or ripples. TARs are found all over Mars, and are typically located near layered terrains, or near fields of large dark dunes as they are here in Proctor Crater in the Southern hemisphere.

TARS form transverse (perpendicular) to the wind direction and are thought to be composed of coarse-grained material. They also appear to be indurated (hardened) and may be much less mobile than the larger dunes.

Written by: Dan Berman  (25 October 2011)

This is a stereo pair with ESP_024515_1320.
 
Acquisition date
14 October 2011

Local Mars time
14:27

Latitude (centered)
-47.728°

Longitude (East)
31.009°

Spacecraft altitude
252.1 km (156.7 miles)

Original image scale range
54.5 cm/pixel (with 2 x 2 binning) so objects ~163 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
23.6°

Phase angle
78.8°

Solar incidence angle
63°, with the Sun about 27° above the horizon

Solar longitude
15.1°, Northern Spring

For non-map projected images
North azimuth:  95°
Sub-solar azimuth:  54.8°
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ADDITIONAL INFORMATION
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HiView

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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.