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collection:
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nasa new
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nasa new
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mediatype:
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image
mediatype
image
mediatype
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collection:
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nasa
collection
nasa
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collection:
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nasaimageofthedaygal lery
collection
nasaimageofthedaygal lery
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title:
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Registan Dunes: Image of the Day
title
Registan Dunes: Image of the Day
title
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description:
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In southern Afghanistan, shifting sand dunes flow across the huge, sandy desert known as the Registan. When the winds constantly blow from the same direction over relatively flat terrain with a small to moderate amount of sand, the sand will pile up in crescent-moon shaped dunes, whose thin tips point in the direction of the wind flow. Called barchan dunes, these dunes will migrate across the desert surface as sand grains on the crest of the dune are toppled by the wind and spill down the leeward face of the mound. As the pile of sand on the leeward side (the side protected from the wind) gets larger, gravity eventually topples the growing pile, moving the dune's leading edge slowly forward. Large barchan dunes, such as those found in White Sands National Monument in New Mexico, often migrate between 8 and 15 feet each year. This Advanced Spaceborne Thermal Emission and Reflection Radiometer asterweb.jpl.nasa.go v (ASTER) image captured on August 20, 2000, shows an area of barchan dunes in the northern Registan Desert, just south of the Afghan city of Kandahar. Many of the dunes retain a near-perfect crescent shape, with the bowl of the crescent on the left and the tips on the right. This orientation reveals that the predominant winds in the area blow from the west-southwest.
description
In southern Afghanistan, shifting sand dunes flow across the huge, sandy desert known as the Registan. When the winds constantly blow from the same direction over relatively flat terrain with a small to moderate amount of sand, the sand will pile up in crescent-moon shaped dunes, whose thin tips point in the direction of the wind flow. Called barchan dunes, these dunes will migrate across the desert surface as sand grains on the crest of the dune are toppled by the wind and spill down the leeward face of the mound. As the pile of sand on the leeward side (the side protected from the wind) gets larger, gravity eventually topples the growing pile, moving the dune's leading edge slowly forward. Large barchan dunes, such as those found in White Sands National Monument in New Mexico, often migrate between 8 and 15 feet each year. This Advanced Spaceborne Thermal Emission and Reflection Radiometer asterweb.jpl.nasa.go v (ASTER) image captured on August 20, 2000, shows an area of barchan dunes in the northern Registan Desert, just south of the Afghan city of Kandahar. Many of the dunes retain a near-perfect crescent shape, with the bowl of the crescent on the left and the tips on the right. This orientation reveals that the predominant winds in the area blow from the west-southwest.
description
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subject:
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What -- Moon
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What -- Moon
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subject:
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Where -- New Mexico
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Where -- New Mexico
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subject:
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What -- ASTER
subject
What -- ASTER
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subject:
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What -- Advanced Spaceborne Thermal Emission and Reflection Radiometer
subject
What -- Advanced Spaceborne Thermal Emission and Reflection Radiometer
subject
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subject:
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Where -- Afghanistan
subject
Where -- Afghanistan
subject
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what:
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Moon
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what:
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ASTER
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what:
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Advanced Spaceborne Thermal Emission and Reflection Radiometer
what
Advanced Spaceborne Thermal Emission and Reflection Radiometer
what
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where:
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New Mexico
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where:
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Afghanistan
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identifier:
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registan_ast_2000233
identifier
registan_ast_2000233
identifier
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uploader:
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gwilliam@archive.org
uploader
gwilliam@archive.org
uploader
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addeddate:
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2011-07-01 03:21:54
addeddate
2011-07-01 03:21:54
addeddate
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publicdate:
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2011-07-01 03:21:54
publicdate
2011-07-01 03:21:54
publicdate
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creator:
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NASA -- Image courtesy NASA/GSFC/MITI/ERSDA C/JAROS, and U.S./Japan asterweb.jpl.nasa.go v/ ASTER Science Team
creator
NASA -- Image courtesy NASA/GSFC/MITI/ERSDA C/JAROS, and U.S./Japan asterweb.jpl.nasa.go v/ ASTER Science Team
creator
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ImageUID:
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file:/home/lunaadmin /Source_download/201 107/1/registan_ast_2 000233/registan_ast_ 2000233_lrg.jpg
ImageUID
file:/home/lunaadmin /Source_download/201 107/1/registan_ast_2 000233/registan_ast_ 2000233_lrg.jpg
ImageUID
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filename:
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registan_ast_2000233 _lrg.jpg
filename
registan_ast_2000233 _lrg.jpg
filename
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date:
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2000-08-20
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rights:
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Public Domain
rights
Public Domain
rights
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source:
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year:
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2000
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