30 Dec '11, 7pm

A new Perspective on Shiveluch Volcano [image] #NASA

A new Perspective on Shiveluch Volcano [image] #NASA

Literally and figuratively, satellites provide a unique perspective on the world. In addition to viewing Earth from above, many satellite instruments observe in wavelengths of light invisible to the human eye. This view of Russia’s Mount Shiveluch (above, top) shows the active volcano in thermal infrared wavelengths—heat energy. The hotter a surface is, the brighter it glows in thermal infrared. Researchers can also use the view from above to build topographic maps of the Earth’s terrain (above, lower). These images were collected by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) aboard NASA’s Terra satellite. When the top image was taken, during the late night hours of December 27, 2011, the 3,283-meter (10,770-foot) summit of Shiveluch rose above a layer of low-lying clouds. The coldest, and therefore darkest, part of the image is Shiveluch’s ...

Full article: http://earthobservatory.nasa.gov/NaturalHazards/view.php?...

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earthobservatory.nasa.gov 31 Dec '11, 11pm

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