Lightning

29 Mar 2013

At Hossein Turner's place, http://hozturner.blogspot.co.uk/feeds/posts/default ... a link to a video of electrictiy in the sky is at www.circuitsinourskies.com/index.html

Over at http://io9.com/volcanic-lightning-how-does-it-work-459806533?utm ... lightning from volcanoes, with lots of pictures - see also www.mrietze.com/web13/japan13.htm where German photographer Martin Rietze took the picture at Sakurajima volcano in Japan. Lightning activity is is highest during the intitial stages of an eruption - and there is a particularly nice image of lightning during Iceland's Surtsey eruption in 1963. Researchers think electrical activity is caused by the ejection from the volcano into the atmosphere of material carrying a large positive charge. As the charged ejecta makes its way skywards it meets regions of opposite but separated electric charge takes shape. A lightning bolt is nature's way of balancing the charge distribution - but there are problems with this idea. Read the article.

See also http://geology.com/articles/volcanic-lightning/