Earth from Space - Image Information

LOCATION Direction Photo #: ISS049-E-1028 Date: Sep. 2016
Geographic Region: BOLIVIA

Sunglint on Lake Titicaca

An astronaut aboard the International Space Station used a long lens to capture the fleeting features of the sun's reflection point around islands in Lake Titicaca in the high plateau of the Andes. Lake Titicaca is the largest lake in South America, and lies partly in Peru, partly in Bolivia. Astronauts see numerous complex "sunglint" patterns like these as they look down on Earth.

Here dramatic reflection-point patterns are strongly affected by the wind because wind-ruffled water and smooth water reflect sunlight differently. Strong westerly winds that blow most months of the year disturb the water surface, enhancing bright reflection over most of the top half of the image where the lake is exposed to the wind. Wind is also channeled between steep-sided islands making for strong reflections on both sides of Isla Suriqui (image left margin). But in protected zones--as in the big area downwind of isla Suriqui (northeast of Isla Suriqui) there is no brilliant reflection to blot out color in lake water.

The "sunglint" pattern tells other stories. The curved line at image top left seems to show a pulse of water entering this part of the lake through a narrow strait. The pattern of parallel lines at image top center may represent a "packet" of earlier pulses, features often seen by astronauts in the seas of the world.

At image lower right the straight lines of many boat wakes cut across curved wind-streak lines--none of which would be visible from space outside the glint point (at image lower right). The area of detailed (inset) shows a cluster of V-shaped boat wakes of traffic going to and from the small port on the island lower center. At 3812 meters (12,500 feet) above sea level, Lake Titicaca is one of the highest commercially navigable lakes in the world.

Images: All Available Images Low-Resolution 108k
Mission: ISS049  
Roll - Frame: E - 1028
Geographical Name: BOLIVIA  
Center Lat x Lon: 16.3S x 68.7W
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: 46   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 800  
Nadir to Photo Center Direction: NW   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: 20160910   YYYYMMDD
Time: 172849   GMT HHMMSS
Nadir Lat: 18.7S  
Latitude of suborbital point of spacecraft
Nadir Lon: 65.7W  
Longitude of suborbital point of spacecraft
Sun Azimuth: 322   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 220   nautical miles
Sun Elevation: 61   Angle in degrees between the horizon and the sun, measured at the nadir point
Atmosphere Views:  
Man Made Views: PORT  
City Views:  

Photo is not associated with any sequences

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