Earth from Space - Image Information

LOCATION Direction Photo #: STS026-43-98 Date: Oct. 1988
Geographic Region: CHAD

STS026-043-098 Wind Streaks of Northern Chad, Chad October 1988
The dynamic forces of nature are very evident in this high-oblique, southwest-looking photograph of northern Chad. In addition to producing dramatic expression in wind streaks aligned northeast-southwest, nature has created a unique landscape of well-entrenched, wind-eroded patterns by the predominate wind that begins in the Libyan Desert, blows toward the southwest across the Djourab Sand Region of central Chad, and is funneled between the two more resistant landform features--the Tibesti Mountains and the Ennedi Plateau (both dark colored). The Tibesti Mountains, which are mainly volcanic in origin (northwestern edge of the photograph), are the highest mountains in the Sahara Desert and cover a much broader areal extent than the Ennedi Plateau, a sandstone plateau (eastern edge of the photograph) less resistant to wind and water erosion forces; thus, the plateau is being eroded at a higher rate than the Tibesti Mountains. When wind speeds attain sufficient velocities, sand particles are transported in the lower atmosphere causing a duststorm, such as the one that is pictured here in the Djourab Sand Region of central Chad. Two dark features are barely visible toward the southern horizon--the vague outline of Lake Chad and the vegetative transition zone known as the Sahel (the greening line) where the nonvegetated desert meets the semiarid grassland region of southern Chad.

Images: All Available Images Low-Resolution 81k
Mission: STS026  
Roll - Frame: 43 - 98
Geographical Name: CHAD  
Center Lat x Lon: 19.0N x 20.0E
Film Exposure: N   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 20
Camera:: HB
Camera Tilt: HO   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 50  
Nadir to Photo Center Direction: W   The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?: N   Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number: 45  
Date: 19881002   YYYYMMDD
Time: 102118   GMT HHMMSS
Nadir Lat: 20.4N  
Latitude of suborbital point of spacecraft
Nadir Lon: 24.4E  
Longitude of suborbital point of spacecraft
Sun Azimuth: 186   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 169   nautical miles
Sun Elevation: 65   Angle in degrees between the horizon and the sun, measured at the nadir point
Water Views:  
Atmosphere Views: DUST  
Man Made Views:  
City Views:  

Photo is not associated with any sequences

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