
%0 Journal Article
%A Lewis, R. 
%A Lee, T. 
%T The transient electric fields about a loop on a halfspace
%J Exploration Geophysics
%D 1978/12/01
%V 9
%N 4
%P 173-177
%K 
%R https://doi.org/10.1071/EG978173
%U https://www.publish.csiro.au/paper/EG978173 
%X The transient electric field excited by a step current in a loop of radius a on the surface of a ground of conductivity s and permeability m0 are concentrated in a toroidal zone. At early times the zone moves slightly inward from the loop and down but at later time the field maximum moves along a cone dipping at 30° away from the loop. At later times the maximum occurs beneath a point on the surface at radius R where R2 » 2.56 t/sm0. At this maximum the time rate of change of the radial magnetic induction is zero. 
