Active High-Latitude Dune-Gullies
NASA/JPL/UArizona
Active High-Latitude Dune-Gullies
ESP_039701_1095  Science Theme: Seasonal Processes
Gully and defrosting activity have been visible here along the edge of a dune field, along with blocks of frost. Observations of the same area help us check for repeat activity, as well as measuring those meter-scale blocks that we’ve seen prior.

In this case, we want to compare any possible changes with a previous observation, which we acquired in 2011. We've also seen images where carbon dioxide frost was the driving process in creating new gullies, so we know their formation is occurring to this day. Tracking for changes, especially when we look at the 1-kilometer enhanced color swath, can help us find more.

This caption is based on the original science rationale.



Written by: HIRISE Science Team (audio: Tre Gibbs)  (17 June 2015)
 
Acquisition date
14 January 2015

Local Mars time
15:29

Latitude (centered)
-70.409°

Longitude (East)
178.239°

Spacecraft altitude
247.2 km (153.6 miles)

Original image scale range
25.0 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
9.1°

Phase angle
47.4°

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

Solar longitude
272.3°, Northern Winter

For non-map projected images
North azimuth:  101°
Sub-solar azimuth:  37.9°
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   (562MB)

IRB color
map-projected   (302MB)

JP2 EXTRAS
Black and white
map-projected  (259MB)
non-map           (368MB)

IRB color
map projected  (109MB)
non-map           (314MB)

Merged IRB
map projected  (130MB)

Merged RGB
map-projected  (125MB)

RGB color
non map           (324MB)
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.