Abstract
Data are presented which suggest that the sunrise effect on the atmospheric electric potential or its gradient (and conduction current) close to the surface is caused by processes in the upper atmosphere, while at the same time other processes of local origin also appear to partake in this phenomenon. The sunrise effect on the atmospheric electric potential gradient has been shown to be related to an electrode effect. Simultaneous records of the atmospheric electric potential and conduction current reveal that the rise in both of these parameters commences before ground sunrise. However the current rise lags behind the potential gradient rise which has been tentatively explained.
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