<P> The global atmospheric electrical circuit describes the continuous movement of atmospheric electricity between the ionosphere and the Earth . Through solar radiation, thunderstorms, and the fair - weather condition, the atmosphere is subject to a continual and substantial electrical current . </P> <P> Principally, thunderstorms throughout the world carry negative charges to the earth, which is then discharged gradually through the air in fair weather . </P> <P> This atmospheric circuit is central to the study of atmospheric physics and meteorology . It is used in the prediction of thunderstorms, and was central to the understanding of electricity . In the past it has been suggested as a source of available energy, or communications platform . </P>

What is the electric charge on the ground in fair weather