These thermal images (FLIR) of the craters in Holuhraun, seen from the west, by the Institute of Earth Sciences field group, show the development of the eruption. They were posted on the website of the Icelandic Met Office yesterday.
The upper image, taken on November 18, shows that thermal convection is greatest in the northern part of the fissure, in a crater known as Heimasæta. The temperature of the lava is somewhere in the range 1,147-1,188°C (2,097-2,170°F). The lower image was taken on October 23 when the craters Baugur and Heimasæta were both active.
The Met Office also posted a link to a video shot by a cameraman of national broadcaster RÚV from the air on November 17, showing the molten lava bubbling in the crater and the expanse of the new lava field.