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This is a CH-47 doing a static electrical discharge. The two rotors are 60 feet in diameter, so there is just a ton of coolness being emitted.
Source
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amazing light show
It's called the Kopp-Etchells effect, named after two Soldiers who were killed. Has to do with static electricity around the blades. Check out Michael Yon's webpage. Michaelyon-online.com.
ty Antun I sahll do that, I have always known that it caused Static Electricity, IN fact they have to ground a Helicopter if it is to pick up or drop to a Sub
http://www.military.com/forums/0,15240,198227,00….