Sand Dunes in the Spring
NASA/JPL/University of Arizona
Sand Dunes in the Spring
ESP_025416_2640  Science Theme: Seasonal Processes
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In the winter, Martian dunes north of 70 degrees latitude are covered by a seasonal layer of carbon dioxide ice (dry ice). In the spring as the ice sublimates (goes directly from solid to gas) numerous seasonal phenomena are observed.

Mars' sand dunes are dark, but appear pinkish because they are still covered by ice. Where the ice has cracked, dark sand is visible. On the steep sides of the dunes sand slides down in thin rivulets.

Dark splotches along the crest of the dunes may be sites where gas was released in pops, similar to champagne, carrying sand out in multiple directions.

Written by: Candy Hansen  (29 February 2012)
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Acquisition date
28 December 2011

Local Mars time:
13:07

Latitude (centered)
83.986°

Longitude (East)
233.262°

Range to target site
317.7 km (198.5 miles)

Original image scale range
31.8 cm/pixel (with 1 x 1 binning) so objects ~95 cm across are resolved

Map projected scale
25 cm/pixel

Map projection
Polarstereographic

Emission angle:
0.8°

Phase angle:
64.9°

Solar incidence angle
65°, with the Sun about 25° above the horizon

Solar longitude
49.6°, Northern Spring

For non-map projected images
North azimuth:  117°
Sub-solar azimuth:  313.1°
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IRB color
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Merged IRB
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Merged RGB
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RGB color
non-map projected

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map-projected   (592MB)

IRB color
map-projected   (318MB)

JP2 EXTRAS
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map-projected  (306MB)
non-map           (252MB)

IRB color
map projected  (114MB)
non-map           (222MB)

Merged IRB
map projected  (143MB)

Merged RGB
map-projected  (141MB)

RGB color
non map           (192MB)
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

USAGE POLICY
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.