Field of Transverse Aeolian Ridges in Proctor Crater
Field of Transverse Aeolian Ridges in Proctor Crater
ESP_024449_1320  Science Theme: Aeolian Processes
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

Latitude (centered)

Longitude (East)

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

Emission angle

Phase angle

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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IRB color
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IRB color
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Black and white
map-projected  (97MB)
non-map           (130MB)

IRB color
map projected  (35MB)
non-map           (122MB)

Merged IRB
map projected  (237MB)

Merged RGB
map-projected  (219MB)

RGB color
non map           (114MB)
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

B&W label
Color label
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EDR products

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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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.