Abstract
An evaluation is made of techniques that have been or could be employed to determine the existence and nature of worldwide variations in atmospheric electric phenomena. In the course of a discussion of surface measurements, data from six sites on the surface of the earth are presented. The use of airborne vehicles in studies of global phenomena is discussed and results from soundings and transits are presented. It is concluded that, the use of instrumented aircraft is potentially the most promising technique to use, but that the expenditure of more care and effort than has been employed in the past is required if this potential is to be realized.
