Northern lights in a jar. Or pretty close to it.
By jesseg 190 234 [698] 1247 2645 4538 8579 kbps | flash [html5] auto download

NOTE: For best results, watch at night in a dark room. Much better that way.
(It was hard getting the exposure right without washing anything out.)

Pictured here is a quart canning jar with a hole drilled in the bottom for an extra electrode. The jar is connected to a little old vacuum pump and a 15kv DC TV flyback coil.

Positive is on the right, negative on the left.

As the vacuum is increased, the colorful patterns change and dance about.

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