For more on High Altitude Electromagnetic Pulse (HEMP) from nuclear detonation here is the Department of Homeland Security report on the estimated affects if a hostile use of a HEMP was detonated now.
For more on High Altitude Electromagnetic Pulse (HEMP) from nuclear detonation here is the Department of Homeland Security report on the estimated affects if a hostile use of a HEMP was detonated now.
Which, unfortunately, includes armies being ordered to march into blast zones while the mushroom cloud was still in the sky, so it’s not a very useful metric.