R&D Report 1979-19 : Ground-wave propagation in a realistic terrain. J.H. Causebrook, B. Tait
LF and MF ground-wave propagation over a realistic terrain has been found to be very different to that over an assumed smooth earth. This report describes the basic nature of these differences, which include a non-simple relationship for field variation with distance and a non-free-space relationship between magnetic and electric fields. The theory of why these effects occur is summarized, and the measurements taken to demonstrate their nature are given. Also a description is given of a computer calculation method which has been devised to make use of the new knowledge.