It is suggested that leakage currents flow across Devon, north of Exeter, from large-scale electric-current systems induced in the Atlantic Ocean by the geomagnetic variations incident on the Atlantic Ocean from the ionosphere. This model can account for the variation with period of the contribution of induced current flow to the differences in the magnetic H variations of period > 30 s observed at Exeter and Sidmouth. © 1983.
Hart, A. M., Krause, P. J., & Rosser, W. G. V. (1983). Possible contribution of leakage currents from the Atlantic Ocean to the magnetic-field variations observed in Devon. Physics of the Earth and Planetary Interiors, 32(2), 107–113. https://doi.org/10.1016/0031-9201(83)90132-2