That part of the field of an antenna which is associated with a pulsation of energy to and fro between the antenna and the medium.
Note: The induction field extends theoretically over the whole of space, but is negligible compared with the radiation field except in the neighbourhood of the antenna.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Centre of buoyancy
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM