GE IC660BBD024 controller

Intermediate time EMP. Between the early-time EMP and the magnetohydrodynamic EMP, transitory phenomena produce what is called intermediate-time EMP. This EMP lasts from about 1 µs to about 0.1 s. The intermediate-time EMP observed at the Earth’s surface has a peak electric field strength of a few hundred volts per meter and is predominantly vertically polarized. d. Surface burst EMP. When a nuclear weapon is detonated at or near the surface of the Earth, neutrons and gamma rays are ejected radially outward from the burst center. The surface-burst EMP is a more localized source than the EMP and the event may cause large currents to be induced on long conductors, such as power lines and communication cables. These currents may be propagated along the conductors for great distances from their source. Therefore, this source-region EMP may be important to systems far outside the source region if they are connected to the source region through wires, cables, or other conductors.

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