NASA’s Aqua satellite captured an Ash plume from Eyjafjallajokull Volcano over the North Atlantic
on April 17, 2010. The Eyjafjallajokull volcano in Iceland erupted Wednesday, April 14, for the
second time this month.
As reported by LiveScience.com, scientists have long known the plumes that shoot from the mouths of erupting volcanoes can produce sheaths of lightning. While lightning is typically associated with thunderstorms, hurricanes and other severe weather, the roiling debris clouds of volcanoes can also produce them.
The lighting in volcanic plumes is connected to the rotation that these plumes undergo, something like a tornado. As a plume rotates, it can spawn waterspouts or dust devils, which gather together the electric charges in the plume to form a sheath of lightning.
This was the eruption between glaciers. On the right is Eyjafjallajökull now erupting about 30 times bigger bang. On the left is Katla, dormant for the moment, but will be much bigger if it is triggered. Katla typically awakens every 80 years or so, and having last exploded in 1918 is now slightly overdue.
Volcano at Einhyrningur