Hanging Sand Dunes within Coprates Chasma
NASA/JPL/University of Arizona
Hanging Sand Dunes within Coprates Chasma
ESP_034856_1655  Science Theme: Aeolian Processes
twitter  •  facebook  •  google+  •  tumblr

HICLIP
1080p (MP4)
Audio (MP3)

WALLPAPER
800
1024
1152
1280
1440
1600
1920
2048
2560
2736
2880
4500
4K
8K
10K

HIFLYER
PDF (11 x 17)

HISLIDES
PowerPoint
Keynote
PDF

Dune fields located among canyon wall slopes are also known as “wall dune fields” and are further identified as either climbing or falling. Falling dunes are defined as large bedforms with lee faces on the downhill side—indicating that this is the direction of their migration—and on moderate slopes greater than 10 to 12 degrees. (A lee face is the the down-wind side of a dune.)

On Earth and Mars, these types of dunes are largely controlled by what is called “microtopography.” Physical obstacles can accelerate and decelerate airflow, create turbulence, potentially enhancing erosion, deposition, and/or transport of dune sediment.

This class of dune morphology is relatively rare across Mars. However, falling dunes (like these) and climbing fields are frequently located among the spur-and-gully walls in the Melas and Coprates chasmata (see the paper here). Here is one example, of active falling dunes on this large massif in east Coprates Chasma

Additional information:
ESP_053739_1650
Digital terrain map

Written by: Matthew Chojnacki (audio: Tre Gibbs)  (4 September 2018)

This is a stereo pair with ESP_035278_1655.
 
Acquisition date
02 January 2014

Local Mars time:
15:07

Latitude (centered)
-14.348°

Longitude (East)
303.787°

Spacecraft altitude
276.9 km (173.1 miles)

Original image scale range
27.7 cm/pixel (with 1 x 1 binning) so objects ~83 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
18.9°

Phase angle:
73.5°

Solar incidence angle
60°, with the Sun about 30° above the horizon

Solar longitude
70.9°, Northern Spring

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  46.5°
JPEG
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

JP2
Black and white
map-projected   (1010MB)

IRB color
map-projected   (636MB)

JP2 EXTRAS
Black and white
map-projected  (537MB)
non-map           (446MB)

IRB color
map projected  (203MB)
non-map           (421MB)

Merged IRB
map projected  (244MB)

Merged RGB
map-projected  (249MB)

RGB color
non map           (393MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

DIGITAL TERRAIN MODEL (DTM)
DTM details page

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.