The effects of corona and angle of arrival on the EMP response of cables lying on the surface of the Earth

This report establishes that corona is not a significant factor in determining the coupling of source-region EMP to long cables positioned on or near the Earth. A parametric comparison is given for the effect of angle of arrival on various lengths of cables exposed to source-region EMP. In addition, these calculations show that worst-case surface cable response is not necessarily caused by the largest peak amplitude incident field. Instead, the response tends to be more directly related to the time integral of the late time portions of the incident electric field.