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Volcanic Ash Cloud Monitoring

The infrared differential imagery of the MTSAT split window channels (10.8-12.0 µm) can distinguish volcanic ash clouds from conventional ice/water clouds. The two images below show how Infrared differential imagery works in the detection of volcanic ash clouds with the eruption of Anatahan volcano in the Mariana Islands. Although Infrared imagery (left) does not show any distinct difference between volcanic ash and ice/water clouds, in the Infrared differential imagery on the right volcanic ash clouds from the Anatahan volcano can clearly be seen due to their brighter appearance.

sample of volcanic ash cloud monotoring
Infrared imagery (Right) and Infrared differential imagery (Left)
00 - 23 UTC on July 5, 2005.

Last updated 10 March 2009 (E)