|NASA Photo ID||ISS010-E-13539|
|Time taken||14:25:12 GMT|
1000 x 661 pixels 540 x 357 pixels 1000 x 661 pixels 540 x 334 pixels 540 x 357 pixels 3032 x 2064 pixels 639 x 435 pixels
|Kodak DCS760c Electronic Still Camera|
|3060E: 3060 x 2036 pixel CCD, RGBG array|
|1000 pixels||661 pixels||No||Yes||Earth From Space collection||Download Image|
|540 pixels||357 pixels||Yes||Yes||Earth From Space collection||Download Image|
|1000 pixels||661 pixels||No||Yes||NASA's Earth Observatory web site||Download Image|
|540 pixels||334 pixels||Yes||Yes||NASA's Earth Observatory web site||Download Image|
|540 pixels||357 pixels||Yes||Yes||NASA's Earth Observatory web site||Download Image|
|3032 pixels||2064 pixels||No||No||Download Image|
|639 pixels||435 pixels||No||No||Download Image|
The Issaouane Erg (sand sea) is located in eastern Algeria between the Tinrhert Plateau to the north and the Fadnoun Plateau to the south. Ergs are vast areas of moving sand with little to no vegetation cover. Considered to be part of the Sahara Desert, the Issaouane Erg covers an area of approximately 38,000 km2. These complex dunes form the active southwestern border of the sand sea.
The most common landforms in the image are star dunes and barchan (or crescent) dunes. Small linear dunes appear at top left. Star dunes are formed when sand is transported from variable wind directions, whereas barchan dunes form in a single dominant wind regime. The superimposition of two dune types suggests that wind regimes have changed through time. The active nature of this portion of the Erg is well illustrated by this image--smaller dunes form and migrate along the flanks of the larger dunes and sand ridges. Occasional precipitation fills basins formed by the dunes; as the water evaporates, salt deposits are left behind which appear as bluish-white areas.