29 Mar 2013

At Hossein Turner's place, ... a link to a video of electrictiy in the sky is at

Over at ... lightning from volcanoes, with lots of pictures - see also 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