It is vitally important to recognize that there is no direct danger to human or other life forms from a high altitude nuclear detonation. There will be a flash of light. There will not be a blast. There will not be any harmful radiation.
TXAZ did an extremely good job of showing the effects from a ground burst detonation but it has little to do with the effects of an HEMP. The only people who will be directly or indirectly affected by an HEMP are those who depend on electronics for life. People in an ICU or those on kidney dialysis. Your pace maker may be affected. (the pace maker is embedded in your body and may not be affected)
The E1 pulse is generated locally over a very wide area. If you are in a line of sight with the HEMP your electronics will be affected unless they are shielded. A typical Faraday cage will not stop the E1 pulse. You need highly conductive solid shielding and multiple layers are better than one thick shield. (due mostly to the capacitive effect)
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