Explicit full identification of a transient dipole source in the atmosphere from measurement of the electromagnetic fields at several points at ground level

Identification of a transient dipole source over a perfectly conducting gro und by measuring electromagnetic fields at several ground points is conside red. It is shown that the full information concerning the dipole source (in cluding the location, the orientation, and the transient moment of the dipo le) can be determined uniquely by measuring the electromagnetic fields at t wo ground points if the dipole orientation does not lie on the plane formed by the dipole and the two measurement points. Explicit identification form ulas are given to reconstruct all the parameters which describe the transie nt dipole source. Under any circumstances all the parameters can be determi ned by measurements at any three ground points which are not along a line. The reconstruction algorithm is tested with clean and noisy data.