Abstract
At high frequencies of the order of 10 MHz or more gaps in the noise radiation from lightning discharges follow a different distribution law dependent on whether or not the radiation emanates from a cloud or a ground flash. A detailed investigation has shown that the gap-width distribution for cloud flashes can be expressed byn(w) c = A exp (−0.575w) while the corresponding expression for ground flashes isn(w) g = B exp (−0.102w), wheren(w) c andn(w) g are the number of gaps occurring for a particular gap-widthw with cloud respectively ground flashes. The constantsA andB depend merely on the total number of flashes under consideration. For a given number of thunderstorms the two distribution laws intersect at a fairly well defined value ofw=11 ms. Gap-widths greater than this value can be attributed to ground strokes while shorter gaps seem to be connected with the noise radiated from cloud discharges. Based on this “critical” gap-width, ground flash counters have been designed that show good discrimination against cloud flashes.
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