Wind Flow
NASA/JPL/University of Arizona
Wind Flow
ESP_057930_1720  Science Theme: Aeolian Processes
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The atmospheric pressure on Earth at sea level is about 1 bar. On Mars, the pressure is 6 to 10 millibars, or 1/100th that of our planet. But even in this atmosphere, wind still flows around obstacles.

In this image the ripples in the sand tell us which way the wind was moving and how it was diverted around these rock formations. (Typically the wind direction is perpendicular to the crest of the dune or in this case, the ripples.)

Written by: Candy Hansen (audio: Tre Gibbs)  (4 February 2019)

This is a stereo pair with ESP_057864_1720.
 
Acquisition date
05 December 2018

Local Mars time
14:11

Latitude (centered)
-8.010°

Longitude (East)
25.136°

Spacecraft altitude
261.4 km (162.5 miles)

Original image scale range
26.2 cm/pixel (with 1 x 1 binning) so objects ~79 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
2.1°

Phase angle
32.4°

Solar incidence angle
34°, with the Sun about 56° above the horizon

Solar longitude
300.8°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  338.8°
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   (586MB)

IRB color
map-projected   (337MB)

JP2 EXTRAS
Black and white
map-projected  (303MB)
non-map           (307MB)

IRB color
map projected  (91MB)
non-map           (275MB)

Merged IRB
map projected  (132MB)

Merged RGB
map-projected  (126MB)

RGB color
non map           (266MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph 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.