The relation between precipitation current, potential gradient, and rate of precipitation

An account is given of the measurement of total air earth current density under conditions of nimbo-stratus precipitation. The appartus used was that developed by Adamson (1955) employing an exposed collecting surface with compensation for displacement currents. Simultaneous measurements of the potential gradient F and the rate of rainfall were carried out and an attempt made to correlate the current density with the variation of F and r, with particular reference to the results of Chalmers (1956) who established the empirical relationship I m (F-0) where a and c are positive constants.