ASTER image of the Eyjafjallajökull-Fimmvörðuháls vents at 1350 local time on 19 April. The image shows both visible information and heat signatures from areas of anomalously high thermal infrared (IR) radiation (for colored versions, yellow is hottest, red, cooler). Courtesy of Rob Simmon, the U.S./Japan ASTER Science Team, and Holli Riebeek, NASA Earth Observatory.