Dust Devil Tracks and Slope Streaks on Martian Sand Dunes
NASA/JPL/University of Arizona

Dust Devil Tracks and Slope Streaks on Martian Sand Dunes
ESP_031199_2070  Science Theme: Aeolian Processes
German Spanish Italian Icelandic Turkish 


HICLIP

720p (MP4)  
Listen to the text  

WALLPAPER

800  1024  
1152  1280  
1440  1600  
1920  2048  
2560  2880 

HIFLYER

PDF, 11 x 17 in  

HISLIDES

PowerPoint  
Keynote  
PDF  
This observation shows a sand dune field in the Nili Fossae region of Mars. The dark lines swirling over the surface of the dunes are the tracks of dust devils.

Dust devils are whirlwinds that pick up the light colored dust on the surface as they move around in odd patterns. The lines visible on the dunes are the dark sand left behind when the surface layer of dust has been removed.

This area was previously imaged in August 2009, about two Mars years ago, and in that image dust devil tracks were also visible. However the tracks visible now are completely different from the earlier ones. This tells us that there has been at least one dust storm since then to erase the old tracks, and lots of dust devil activity to create the new ones.

We can also see dark linear streaks going down the slopes of the dunes. These features are caused by some sort of flow down the slope of the dune which strips away the light surface layer of dust. In 2009, similar streaks were observed on the slopes of the dunes, however they were different from the ones which are observed now. Thus the flows which are causing these streaks are still active today.

Written by: Corwin Atwood-Stone (audio by Tre Gibbs)   (15 May 2013)

  Click to share this post on Twitter Click to share this post on Facebook Click to share this post on Google+ Click to share this post on Tumblr


 Image Products: All image links are drag & drop for HiView, or click to download
JPEG
Grayscale: map projected  non-map
IRB color: map projected  non-map
Merged IRB: map projected
Merged RGB: map projected
RGB color: non-map projected

JP2 DOWNLOAD
Grayscale: map-projected (163.3 MB)
IRB color: map-projected (96.1 MB)

JP2 EXTRAS
Grayscale: map-projected  (82.4 MB),
non-map  (76.5 MB)
IRB color: map projected  (31.4 MB)
non-map  (87.0 MB)
Merged IRB: map projected  (169.4 MB)
Merged RGB: map-projected  (155.8 MB)
RGB color: non map-projected  (81.4 MB)

ADDITIONAL IMAGE INFORMATION
Grayscale label   Color label
Merged IRB label   Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:23 March 2013 Local Mars time: 2:20 PM
Latitude (centered):26.658° Longitude (East):62.811°
Range to target site:288.1 km (180.0 miles)Original image scale range:57.6 cm/pixel (with 2 x 2 binning) so objects ~173 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:7.6° Phase angle:66.5°
Solar incidence angle:61°, with the Sun about 29° above the horizon Solar longitude:287.5°, Northern Winter
For non-map projected products:
North azimuth:97° Sub-solar azimuth:313.3°
For map-projected products
North azimuth:270°Sub solar azimuth:127.3°

Context map

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: Image: NASA/JPL/University of Arizona
Postscript
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. 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. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.