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In page Nuclear electromagnetic pulse:

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In a vacuum and absent a magnetic field, the electrons would travel with a current density of tens of amperes per square metre.[2] Because of the downward tilt of the Earth's magnetic field at high latitudes, the area of peak field strength is a U-shaped region to the equatorial side of the detonation. As shown in the diagram, for nuclear detonations in the Northern Hemisphere, this U-shaped region is south of the detonation point. Near the equator, where the Earth's magnetic field is more nearly horizontal, the E1 field strength is more nearly symmetrical around the burst location.[citation needed]