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Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
That is absolutely incredible! I would guess that the hot ash particles rubbing together creates a huge static charge that you see being released in the picture, on the same basic principal of a Van der Graff generator.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Interesting. Although in this case I think that the simpler explanation of ash particles rubbing together (after being ejected at high speed from a volcano) would generage the effects seen. The fireballs could be nothing more than hot gases igniting on contact with air, although some theories suggest that they might be caused by localised air breakdown (intense electrical field gradient + RF excitation by continuous lightning discharges)
Registered Member #1361
Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
Lots of pics of erupting volcano's have lightning around them, it i most likely the ash, but it may also be lightning from the clouds also, since the ashes and charges make a fairly conductive trail at those voltages.
... not Russel! Registered Member #1
Joined: Thu Jan 26 2006, 12:18AM
Location: Tempe, Arizona
Posts: 1052
An excellent picture. Where did you find it? It would be nice to make sure whoever took the picture is getting credit for it.
I think Firefox has it right: that would be my guess as well, without doing any research on the topic. Ash from the center of the column is probably moving much faster than ash on the outside of the column. This is going to cause particles to rub against eachother, essentially creating a big VDG in the sky.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Noelle wrote ...
Because this lightning is produced electrostatically and not due to temperature/pressure changes, there would be no thunder, correct?
Hm, I don't think it's that romantic actually - I'm pretty sure there's thunder just with like any other lightning, together with other sounds produced by the volcano.
The pic is indeed amazing though. Anyone found more information on it? Looks like a quite long bulb exposure. And to me it looks that most if not all of those 'fireballs' are just incandescent ash at places where lightning passes through the ash column.
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Fireballs and lightning from volcano in Chile.. ??!!!!!
