Dune Field in Noachis Terra
NASA/JPL/UArizona
Dune Field in Noachis Terra
ESP_013348_1185  Science Theme: Aeolian Processes
This dune field is on the floor of a small crater in Noachis Terra located in the Southern hemisphere of Mars.

The slip faces of the dunes have multiple directions, indicating that there were several wind directions and changes in wind strength when the dunes formed. The dominant dune type are transverse dunes (oriented perpendicular to the prevailing wind direction), with modified barchans (crescent-shaped dunes) in the northern region of the field and incipient linear dunes in the southern region.

The bright material scattered throughout the dune troughs, as well as at the bottom of the image, are outcrops of underlying bedrock.

The bottom of the image clearly displays a mass of dark dust devil tracks. Dust devils are wind funnels that suck up dust as they travel over the surface exposing the dark sandy substrate.



Written by: Kelly Kolb & Circe Verba  (29 July 2009)
 
Acquisition date
01 June 2009

Local Mars time
15:05

Latitude (centered)
-61.083°

Longitude (East)
346.238°

Spacecraft altitude
251.0 km (156.0 miles)

Original image scale range
50.2 cm/pixel (with 2 x 2 binning) so objects ~151 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.7°

Phase angle
48.5°

Solar incidence angle
48°, with the Sun about 42° above the horizon

Solar longitude
277.0°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  34.2°
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   (294MB)

IRB color
map-projected   (152MB)

JP2 EXTRAS
Black and white
map-projected  (160MB)
non-map           (174MB)

IRB color
map projected  (74MB)
non-map           (180MB)

Merged IRB
map projected  (282MB)

Merged RGB
map-projected  (265MB)

RGB color
non map           (175MB)
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.