Propagation of a low frequency electromagnetic pulse generated by an electric dipole in seawater

An exact analytic solution for the propagation in seawater of a low frequen cy electromagnetic pulse generated by an electric dipole is investigated. T he dipole is excited by a rectangular current pulse with a finite, nonzero rise and decay time. The frequency-domain formula for the downward-travelli ng field of a horizontal electric dipole excited by a pulse is Fourier tran sformed to obtain an explicit expression for the field that is uniformly va lid in distance and time. It is noted that the present analysis may be used for studying pulse propagation in any highly conducting medium besides sea water.