GE IC693CPU363 Power module

Late time EMP. During the late time portion of the EMP, currents are induced in the ground by the effects of the expanding and rising fireball constituents. These effects are called the magnetohydrodynamic EMP. As a result the currents produced induce image currents in the ground over a period of 10 to 100 seconds. Although the field strengths produced at the surface by the magnetohydrodynamic EMP are small (tens of volts per kilometer), they occur over long times. Thus, the magnetohydrodynamic EMP is a consideration for long power and communications lines and, because of its duration, for the energy it can deliver to protective devices.

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