Feathery Ridges
NASA/JPL/UArizona
Feathery Ridges
ESP_036485_1765  Science Theme: Fluvial Processes
This HiRISE image shows a valley filled with an assortment of linear ridges. These ridges are often referred to as transverse aeolian ridges, or TAR, and they take a variety of forms. Here they sit at right angles to the direction of the valley, because the topography funnels the wind along the trough.

At this location, some of the TAR have secondary structures, likely small ripples. It is common for sand dunes to be covered in small ripples, often with different orientations that may be shaped by winds redirected by the larger dunes. Here the secondary structures have an unusual radiating/converging pattern, giving the TAR here a feathery appearance.



Written by: Colin Dundas  (2 July 2014)
 
Acquisition date
09 May 2014

Local Mars time
15:32

Latitude (centered)
-3.415°

Longitude (East)
112.013°

Spacecraft altitude
265.3 km (164.9 miles)

Original image scale range
26.5 cm/pixel (with 1 x 1 binning) so objects ~80 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.0°

Phase angle
56.9°

Solar incidence angle
57°, with the Sun about 33° above the horizon

Solar longitude
128.0°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  32.4°
JPEG
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Merged IRB
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Merged RGB
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non-map           (443MB)

IRB color
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non-map           (407MB)

Merged IRB
map projected  (171MB)

Merged RGB
map-projected  (175MB)

RGB color
non map           (394MB)
ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products
HiView

NB
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

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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.