Sunday, March 24, 2013

APOD 3.8: Sakurajima

It looks very alien for a volcanic eruption to produce lighting, as Sakurajima does in this picture. Located in southern Japan, Sakurajima volcano was erupting in early January, the magma being so hot it glowed. Liquid rock burst forth from beneath the surface. Volcanic lightning is currently a prevalent research topic because it is still a somewhat mysterious phenomenon; the lightning bolts help "quench areas of opposite but separated electric charges." One hypothesis posits that magma bubbles and volcanic ash are electrically charged, and created separated areas with their motion. Or, charge-inducing collisions of volcanic dust could spur on a spot of lightning, which strikes 40 times each second, somewhere on Earth.

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