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NEMP weapons are designed to maximize such EMP effects as the primary damage mechanism, and some are capable of destroying susceptible electronic equipment over a wide area.
An NEMP warhead designed to be detonated far above the Earth's surface is known as a high-altitude electromagnetic pulse (HEMP) device.
The explosion releases a blast of gamma rays into the mid-stratosphere, which ionizes and the resultant energetic free electrons interact with the Earth's magnetic field to produce a much stronger EMP than is normally produced in the denser air at lower altitudes