For those who really are into nuclear weapons...

dennilfloss

Past Lifer 1957-2014 In Memoriam
Oct 21, 1999
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SSP,

I think that they may be discharges of currents due to the electromagnetic pulse in surface blasts. We don't see those in high atmospheric blasts as far as I know. Or they could be monitoring rocket trails.

Here's another detailed explanation of what happens during the various types of nuclear explosions, along with Quicktime videos for download.

All Over The World (Electric Light Orchestra)