What's this filaments of a nuclear explosion?

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The filaments at the red pointer. Is that the result of shockwave?

Thanks
 

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i've often wondered the same thing regard that pic (or one very similar to it).

maybe it's blackbirds being toasted midflight.
 
Offhand, I believe those are smoke streamers deliberately deployed to observe air movement.

[ EDIT: http://en.wikipedia.org/wiki/Mushroom_cloud#Physics" ]

"...the streaks of smoke ... are vertical smoke flares which are used to observe the shockwave..."
 
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