Ball Lightning

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alexjrgreen
Posts: 805
Joined: Thu Nov 13, 2008 4:03 pm
Location: UK

Ball Lightning

Postby alexjrgreen » Sun Feb 08, 2009 9:19 pm

Ball lightning is sometimes claimed as a plasma phenomenon:

Great balls of lightning
http://physicsworld.com/cws/article/news/24175

Long-lived plasmoids generated by surface microwave discharges in chemically active gases
http://www.springerlink.com/content/m12p2u4152v54222/

and Msimon has been in the the same room as some:
http://www.talk-polywell.org/bb/viewtopic.php?p=16006&highlight=#16006

but Art Carlson doubts that it's a high temperature plasmoid:
http://www.talk-polywell.org/bb/viewtopic.php?p=16011&highlight=#16011

What do you think, and why?
Ars artis est celare artem.

Aero
Posts: 1180
Joined: Mon Jun 30, 2008 4:36 am
Location: 92111

Postby Aero » Sun Feb 08, 2009 10:42 pm

I don't know what ball lightning is, but I did see one once while in the service. We were inside during a Florida thunderstorm, as it was winding down. My buddy said, "Look at that! Look at that!" His excitement drew me to the glass door from where I saw a glowing ball sitting on the roof of his car, parked about 30 yards (meters) away. The ball was between one-half to one meter in diameter, reddish orange on the fringes, the color transitioned through the spectrum to a dark blue in the center. The diameter of the the bluish center was maybe one third the overall diameter. The ball seemed to roll very slowly to the back of the roof, then quickly down the back window then slowly down the trunk lid to the edge where it dropped off and dissipated on the asphalt. The ball did not change size appreciably until it dissipated. This took about 5 seconds all together. The ball dissipated quickly, but not instantaneously, maybe a few (2 - 4) tenths of a second.

Very soon thereafter, we went out and looked for damage to his car and the paint. There was no discernible damage and in fact, nothing out of the ordinary.

Regarding the movement of this lightning ball; it moved much as you would expect a rubber balloon to move. Slowly down the sloping roof and trunk lid and more quickly off the edges. The lot was graded so cars parked with the front 2- 4 inches higher than the back, hence the slope.
Aero

tomclarke
Posts: 1683
Joined: Sun Oct 05, 2008 4:52 pm
Location: London
Contact:

Postby tomclarke » Mon Feb 09, 2009 5:39 pm

These people claim to create plasmoids stable in air (but not vacuum) and that this is how ball lightning works. It seems plausible to me, since we know ball lightning does exist.

They also hope to collide plasmoids at high speed to do fusion. This is less sensible. For one thing the plasmoids are only stable in air but (presumably) losses accelerating them to high energies would be very high except in near vacuum.

Best wishes, Tom


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