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Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
More pictures here: Big pictures here, not just of lightning: Looking for a video. Note that most pictures are long exposure shots. See the star tracks.
Registered Member #2123
Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312
Maybe this is how the legend of Thor began. Ever wonder what went through the minds of humans who witnessed something like this four or five thousand years ago?
Can someone in the Icelandic Geological Survey please rename that volcano to, say, Eric or Sven, or something else easy to pronounce?
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
It seems there are several competing theories explaining volcanic lightning, to which I'll add a theory of my own. The upward jet of volcanic ejecta is charged by MHD, and acts as the up-bound side of a VDG belt, carrying the charge upward to points of very high ionization which break out in lightning when the PD between them and some other point is sufficient for dielectric breakdown to occur. This would explain why many of the lightning bolts appear to occur within the clouds of ejecta, as much as they strike down to the ground.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
MinorityCarrier wrote ...
Maybe this is how the legend of Thor began. Ever wonder what went through the minds of humans who witnessed something like this four or five thousand years ago?
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I've further refined my own theory, as follows:
A stream of volcanic ejecta consists of (a) dielectric particles of glass, ash, rock (b) superheated steam (c) ions of all sorts created by high temperature dissociation
A charge is impressed upon it by (a) influence as in influence machines such as Wimshurt's and (b) by magnetohydrodynamics (MHD) as the ejecta moves rapidly through the earth's field.
The upward ejecta stream I liken to the upward movement of a VDG dielectric belt.
As it ascends, the superheated water and other gases cool until a point is reached where the water starts condensing, and takes the ions into solution, forming a highly conductive spheroid. More charge is delivered into this reservoir by further ascending dielectric particles until dielectric breakdown occurs between the condensate mass, and some point of potential difference further down the column. This explains why many of the lightning bolts are within the rising mass of ejecta, rather than bolts to ground, as with conventional lightning.
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Spectacular images of volcanic lightning in the Icelandic eruption
