Volcanic Lightning in Southern Chile

Source - Space Weather News for April 23, 2015: http://spaceweather.com

The Calbuco volcano in southern Chile erupted yesterday. Two blasts in 24 hours on April 22nd sent plumes of ash and sulfurous gas shooting at least 33,000 feet high. One of the eruptions occured at night and put on a spectacular display of rare and mysterious volcanic lightning. 

Visit http://spaceweather.com for a picture of the lightning and a discussion of its underlying physics.