MODELING OF AN EMP CONDUCTED ENVIRONMENT

The international Electrotechnical Commission (IEC) decided in 1988 to produce a civil standard on the electromagnetic effects of a High Alt itude EMP (HEMP), Different documents pertaining to the radiated envir onment and to specifications and test methods have been elaborated and are circulated, A standard conducted environment dependent on many pa rameters is, however, more difficult to define. The aim of this work i s to present a probabilistic approach which has been adopted to define a typical current shape for the conducted environment. The distributi on functions of the peak current value for horizontal acid vertical po larizations based on 1710 calculated cases reflecting a variation of t he elevation and azimuthal angles from 0 to 90 degrees are presented a nd discussed.