Ash from Grímsvötn spread over the North Sea on May 24, 2011, canceling several hundred flights in Scotland and Scandinavia.
Published May 24, 2011
A satellite records a vertical profile of the atmosphere and reveals the altitude of ash clouds.
Published May 25, 2010
Color codes reveal ash layers at different altitudes during eruptions at Eyjafjallajökull Volcano on April 19, 2010.
Published Apr 28, 2010
Days after a large-scale eruption from Chile's Chaiten Volcano on February 19, 2009, volcanic ash lingered on the Patagonian landscape.
Published Feb 25, 2009
A powerful volcanic eruption in South America sent volcanic ash around the world to stop air traffic in New Zealand and Australia. The ash plume is distinct in these images of the two countries.
Published Jun 13, 2011
