Entire subject is well-covered in the classic text in the open literature Glasstone and Dolan, third edition 1977 first edition 1950
Well covered? How many years do I have to read it?? I don’t have that much time left. I see EMP stats and effects start at page 514 and ends at 539.. Simple, right? Can I get it in 25 words or less? It doesn’t even allow for cut and paste. I know. I tried.
As to Forstchen’s book being fiction - so was Atlas Shrugged. How many of us understood what Ayn Rand was telling us in that book? How many of us saw it happening? Wasn’t that fiction?