Wellington - ISS016-E-5121 lrg



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English: A thick blue haze stretched over the South Pacific archipelago of Vanuatu on the morning of April 12, 2010. The haze was volcanic fog—vog—emitted by Gaua and Ambrym Volcanoes. Both are known for producing volcanic plumes rich in sulfur dioxide. The sulfur dioxide gas emitted by the volcanoes reacts with moisture in the air to create small droplets (called aerosols) of sulfuric acid, which scatters blue light, coloring the plume. Although it is unclear which volcano is emitting more aerosols, the Wellington Volcanic Ash Advisory Center (VAAC) has reported daily ash plumes from Gaua since April 8th. The plume extending for thousands of kilometers to the northwest (upper left) and southeast (lower right) of the islands. The plume appears thicker and bluer in the corner of the image because the satellite is viewing the plume at an angle.
Date 12 April 2010(2010-04-12)
Source http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=43667&src=nha
Author NASA image by Jeff Schmaltz
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Public domain This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)


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