Of Swirls and Gullies
NASA/JPL/University of Arizona
Of Swirls and Gullies
ESP_021899_1095  Science Theme: Aeolian Processes
twitter  •  facebook  •  google+  •  tumblr

WALLPAPER
800
1024
1152
1280
1440
1600
1920
2048
2560

HIFLYER
PDF (11 x 17)


This observation is a repeat image of ESP_014185_1095 and ESP_019987_1095. The dune gullies (at edge of the field and here in this subimage) appear active and are anomalous in their location (high latitude).

Tracking definitive changes will be useful in comparison with dune gully activity visible in southern mid-latitudes and the Northern Polar erg. The activity is thought to occur soon after the beginning of the defrosting period.

Perhaps the most striking aspect of this observation are the beautiful swirls of tracks left by dust devils. Like on Earth, dust devils move across the Martian surface, exposing the underlying darker material.

This caption is based on the original science rationale.

Written by: HiRISE Science Team  (2 May 2011)
 
Acquisition date
29 March 2011

Local Mars time:
15:26

Latitude (centered)
-70.340°

Longitude (East)
178.199°

Range to target site
251.0 km (156.8 miles)

Original image scale range
25.1 cm/pixel (with 1 x 1 binning) so objects ~75 cm across are resolved

Map projected scale
25 cm/pixel

Map projection
Polarstereographic

Emission angle:
6.9°

Phase angle:
49.0°

Solar incidence angle
54°, with the Sun about 36° above the horizon

Solar longitude
264.0°, Northern Autumn

For non-map projected images
North azimuth:  100°
Sub-solar azimuth:  37.7°
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   (777MB)

IRB color
map-projected   (297MB)

JP2 EXTRAS
Black and white
map-projected  (328MB)
non-map           (502MB)

IRB color
map projected  (135MB)
non-map           (407MB)

Merged IRB
map projected  (181MB)

Merged RGB
map-projected  (174MB)

RGB color
non map           (403MB)
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.