Estimates for Induced Oceanic Electric Currents Flowing near the Coast and their Associated Magnetic Fields just Inland

Summary In studying the electric currents and magnetic fields arising from induction in the oceans a number of numerical procedures have been devised by various authors. In all of these methods difficulties arise at the edge of the oceans where the electric currents and magnetic fields change appreciably over a small distance. A physical explanation of these phenomena has been given in the preceding paper in terms of magnetic merging. In the present paper estimates are obtained for the electric currents and magnetic fields near the coast. These depend partly upon the induced currents which are enhanced near the ocean'smargin and partly upon the currents far from the edge of the ocean. A two-dimensional model is formulated and related to more general models. The orders of magnitude which are obtained are believed to have certain generality, and are tested against exact calculations.