
TY  - JOUR
A1  - Lewis, R. 
A1  - Lee, T. 
T1  - The transient electric fields about a loop on a halfspace
JF  - Exploration Geophysics
JO  - Explor. Geophys.
Y1  - 1978
VL  - 9
IS  - 4
SP  - 173
EP  - 177
KW  - 
UR  - https://doi.org/10.1071/EG978173 
N2  - 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. 
ER  -

