Abstract
The electric field changes caused by identified cloud and ground lightning flashes have been analyzed in terms of their more conspicuous features, in particular, duration, over-all magnitude, number and size of steps, and presence and maximum slope of ramps. Plots of field change against distance showed reasonable agreement with the inverse cube law, which has been used for normalizing field changes of flashes at various distances between 3 and 20 km. Statistical distributions of the measurements were used as a basis for comparing the field changes of ground and cloud flashes; it was observed that impulsive discharges occurred in both but were more frequent and caused larger field changes in ground flashes than in cloud flashes. Furthermore, flashes in the upper part of the thundercloud involved fewer impulsive discharges than cloud flashes about cloud base level, suggesting that height in the thundercloud influences the mode of discharge.
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