>> Interesting thing: According to Wikipedia [which is never wrong], a 
>> nuclear explosion only generates an EMP because of the Earth's 
>> magnetic field. Like, if it was in space, it wouldn't do that...
> 
> I think I heard it was the atmosphere, not the magnetic field...

Seems the gamma rays generate a current in the atmosphere [which 
wouldn't happen if there was no atmosphere], and the magnetic field 
channels this to the ground [in certain parts of the globe which happen 
to include the USA].

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