Gullies with Meandering Channels and Channels That Widen Downslope
NASA/JPL-Caltech/UArizona
Gullies with Meandering Channels and Channels That Widen Downslope
PSP_005930_1395  Science Theme: Fluvial Processes
Visible here are gullies on the northeast rim of a southern hemisphere crater. Most of the gullies are cut deeply into the crater wall and have narrow channels.

Several of the gully channels have curves—known as meanders—that might indicate that the material the gullies flowed through was easily eroded. The head of many of the gullies can be traced back to the layers exposed on the wall, suggesting that groundwater trickled out of the layers onto the slope.

The floor of the crater contains dark sand dunes as well as some arcuate ridges (wavy features) at the base of the gullies. Arcuate ridges are proposed to be evidence of gravity-driven movement of ice-rich material from the crater walls onto the floor.



Written by: Kelly Kolb  (9 July 2008)

This is a stereo pair with PSP_006853_1395.
 
Acquisition date
01 November 2007

Local Mars time
14:21

Latitude (centered)
-40.304°

Longitude (East)
196.831°

Spacecraft altitude
252.6 km (157.0 miles)

Original image scale range
25.4 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
5.9°

Phase angle
49.5°

Solar incidence angle
45°, with the Sun about 45° above the horizon

Solar longitude
340.3°, Northern Winter

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  41.4°
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   (782MB)

IRB color
map-projected   (390MB)

JP2 EXTRAS
Black and white
map-projected  (341MB)
non-map           (490MB)

IRB color
map projected  (121MB)
non-map           (382MB)

Merged IRB
map projected  (183MB)

Merged RGB
map-projected  (186MB)

RGB color
non map           (359MB)
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-Caltech/UArizona

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.