NASA Satellite Helps Measure Iceland Volcanic Plume

Satellite image of Iceland's Eyjafjallajokull Volcano Left: a view of the ash plume from Iceland's Eyjafjallajökull volcano, taken by the nadir (vertical-viewing) camera on the Multi-angle Imaging SpectroRadiometer (MISR) instrument on NASA's Terra spacecraft. Right: a computer-analyzed map of ash plume heights, corrected to compensate for the effects of wind. Reds are highest, blue lowest. Image credit: NASA/GSFC/LaRC/JPL, MISR Team
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April 20, 2010

NASA's Terra satellite flew directly over Iceland on April 19, 2010, allowing its Multi-angle Imaging SpectroRadiometer (MISR) instrument to capture a series of images of the Eyjafjallajökull volcano and its erupting ash plume. The left panel of this image shows a view from MISR's nadir (vertical-viewing) camera, while the right panel contains a computer-analyzed map of plume heights, which have been corrected to compensate for the effects of wind. The heights are measured in meters, with red being highest and blue lowest. The smaller streamers of the plume are just several hundred meters above the surface, whereas the main plume extends to an altitude of about 4.5 kilometers (2.8 miles). This is smaller than the 7.3 kilometer (4.5 mile) altitude measured by MISR on April 14, 2010, though conditions remain highly dynamic.

The accompanying images at right show the full nadir view at top, and a stereo anaglyph at bottom. The anaglyph was generated from MISR's nadir and 46-degree forward-viewing cameras. When the anaglyph is viewed through 3-D glasses, the plume height can be estimated.



Alan Buis 818-354-0474
Jet Propulsion Laboratory, Pasadena, Calif.
Alan.buis@jpl.nasa.gov

2010-136

Images

Satellite image of Iceland's Eyjafjallajokull Volcano

Full nadir (vertical) view of the ash plume as measured by MISR.
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Anaglyph image of Iceland's Eyjafjallajokull Volcano

Stereo anaglyph of the volcano ash plume, generated from MISR's nadir and 46-degree forward-viewing cameras. When viewed through 3-D glasses, the plume height can be estimated.
› Full image and caption

enlarge image



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