Northern Dunes and Snowfall
Northern Dunes and Snowfall
ESP_062901_2560  Science Theme: Seasonal Processes
Every year we see new slumps on dune slip faces at high northern latitudes, and old slumps are erased by windblown sand. This image was acquired as part of a joint study with MRO’s Mars Climate Sounder (MCS), to determine if the rate of slumping seen by HiRISE corresponds to winter snowfall tracked by MCS.

Be sure to check out the stereo anaglyph using red-green glasses. The slumps look strange in the anaglyph, because they change every year and the other image for the stereo pair was acquired one Mars year ago.

Written by: Alfred McEwen  (26 February 2020)

This is a stereo pair with ESP_054158_2560.
Acquisition date
27 December 2019

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
320.0 km (198.9 miles)

Original image scale range
64.1 cm/pixel (with 2 x 2 binning) so objects ~192 cm across are resolved

Map projected scale
50 cm/pixel

Map projection

Emission angle

Phase angle

Solar incidence angle
59°, with the Sun about 31° above the horizon

Solar longitude
126.8°, Northern Summer

For non-map projected images
North azimuth:  103°
Sub-solar azimuth:  327.2°
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

Black and white
map-projected   (291MB)

IRB color
map-projected   (176MB)

Black and white
map-projected  (178MB)
non-map           (128MB)

IRB color
map projected  (85MB)
non-map           (124MB)

Merged IRB
map projected  (302MB)

Merged RGB
map-projected  (278MB)

RGB color
non map           (116MB)
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

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

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

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.