PIA03779: Nirgal Vallis and its Windblown Dunes
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Global Surveyor (MGS)
 Spacecraft:  Mars Global Surveyor Orbiter
 Instrument:  Mars Orbiter Camera (MOC)
 Product Size:  836 x 1441 pixels (w x h)
 Produced By:  Malin Space Science Systems
 Producer ID:  MOC2-313
 Primary Data Set:  MGS EDRs
 Full-Res TIFF:  PIA03779.tif (1.199 MB)
 Full-Res JPEG:  PIA03779.jpg (215.2 kB)

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Original Caption Released with Image:

Nirgal Vallis is a narrow valley system that stretches approximately 420 kilometers (260 miles) across the martian surface near 28S latitude, north of the large basin, Argyre. The floor of the valley system is largely covered with light-toned dunes and ripples. These windblown features obscure most of the original morphology of the valley floor. This view of a small portion of Nirgal Vallis was obtained by the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) during Extended Mission subphase E02 on March 29, 2001. In each short tributary valley, dunes have a somewhat different orientation compared to those in the other valleys. The dune patterns here indicate that winds are locally controlled by the shape and orientation of each valley. The dunes just left of the center of the image have small craters on them, formed by meteor impact. The craters indicate that the dunes are not fresh, modern features, but are considerably older than they might at first seem. This image covers an area 3 km (1.9 mi) wide and is illuminated from the upper left.

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