Earth from Space - Image Information

LOCATION Direction Photo #: ISS053-E-131330 Date: Oct. 2017
Geographic Region: CHAD

Emi Koussi and Wind Grooves

An astronaut aboard the International Space Station (ISS) took this oblique photograph of one of the large volcanoes found in the central Sahara Desert. Emi Koussi is the dark crater and cone occupying most of the image. The dark lavas erupted from the volcano contrast with the surrounding light-toned sands and bedrock. For scale, the Emi Koussi crater is 12 to 15 kilometers wide (7.5 to 9.5 miles). Canyons, which were eroded by rivers and streams, radiate down the slopes. Click here for an earlier photo of the crater depression.

The Emi Koussi cone rises so high above the surrounding plains (2300 meters or 7,500 feet) that it deflects the dominant winds, which curve around the mountain mass. The lack of vegetation in the desert allows these persistent winds to erode long grooves in soft rocks - geologists call them yardangs. The grooves can be 30 meters deep and up to tens of kilometers long, and they reflect the dominant wind directions.

Emi Koussi is one of a line of volcanoes trending north in the range known as the Tibesti Mountains, which are often photographed by ISS crews. Travel across this countryside is known to be extremely difficult due to the challenging terrain.

Images: All Available Images Low-Resolution 552k
Mission: ISS053  
Roll - Frame: E - 131330
Geographical Name: CHAD  
Center Lat x Lon: 19.8N x 18.6E
Film Exposure:   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 10
Camera:: N6
Camera Tilt: HO   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 240  
Nadir to Photo Center Direction: SW   The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?:   Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number:  
Date: 20171022   YYYYMMDD
Time: 151538   GMT HHMMSS
Nadir Lat: 24.5N  
Latitude of suborbital point of spacecraft
Nadir Lon: 21.8E  
Longitude of suborbital point of spacecraft
Sun Azimuth: 253   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 217   nautical miles
Sun Elevation: 9   Angle in degrees between the horizon and the sun, measured at the nadir point
Land Views:  
Water Views:  
Atmosphere Views:  
Man Made Views:  
City Views:  

Photo is not associated with any sequences

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