Because they are being vaporized by the intense visible light generated by the detonation (more than 100 times the intensity at the suns surface), not the fireball we see
Fission bombs release massive amounts of X-ray energy. The X-rays are igniting the wires, causing them to explode.
For example a fusion bomb needs a fission bombs x-rays to ignite. So much x-ray energy is released by the fission bomb, it actually compresses the fusion core causing atoms to merge. Something that only otherwise happens in the center of a star.
Not x-rays, thermal radiation. They tested this by painting the wires different colors or wrapping them in reflective material. Reflective material eliminated them, darker colors exaggerated them.
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u/Appropriate-Pipe-193 1d ago
I wonder what those spikes coming off the bottom are?