The transient electric field response of an array of parallel wires on the Earth´s surface

The transient electric field response of a step-function current excited cable lying on the surface of a homogeneous and isotropic earth is considered. Attention is focused upon that portion of the response at the earth´s surface where the field is either constant or decaying with time. This information appears to have application in the measurement of the earth´s conductivity using a single cable with finite length and grounded at both ends. Then, by superposition, the response of an array of equally spaced parallel cables is also studied.