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What are those white lines connecting the ground to the sky on the left side of this photo?

I've see these before in the nuclear bomb test films too. They're apparently already in place upon detonation, as the bright backlight from the mushroom cloud suddenly makes these lines appear in the foreground.

I imagine test devices are being shot into the sky before detonation but I'd like to know more about this. Google searching has been fruitless as I don't even know what words I'm supposed to be searching for.

Looking for a brief explanation along with a source citation.

enter image description here

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The comment on this page

http://chemistry.about.com/od/photogalleries/ig/Nuclear-Tests-Photo-Gallery/Operation-Teapot-Test.htm
http://chemistry.about.com/b/2011/04/19/nuclear-explosion-lines-spikes.htm

says:

Sounding rockets or smoke flares may be launched just before a device explodes so that their vapor trails may be used to record the passage of the otherwise invisible shock wave.

To learn about every detail of these tests, contact your nearest FBI agent.

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    $\begingroup$ +1 for the last comment... lol $\endgroup$
    – honeste_vivere
    Commented Sep 14, 2022 at 16:30
  • $\begingroup$ Do you know where the results of the measurements of the passage of the shock wave are to be found? $\endgroup$
    – BlastWave
    Commented Jan 23 at 0:55

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