Unusal Program conducted 15 April

The purpose of the Unusual Program within EISCAT is to carry out measurements on late notice of less predictable geophysical conditions. Volcanoes are known to send gases and ash into the stratosphere, with possible extensions up to the mesosphere. For that reason the EISCAT VHF radar was turned on in the passage of the Eyjafjallajökull volcano ash cloud. However, this volcano was not in the class of producing enough material above the tropopause, but with the exceptional sensitivity of the EISCAT VHF radar, it might nevertheless detect interesting data. A preliminay analysis has been done, see figure, but the data are also open to all associates to make more accurate and detailed studies.