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- W1973553485 abstract "The electric fields produced by stepped and dart-stepped leaders which immediately precede return strokes in lightning discharges to ground have been recorded in Florida and Arizona. The mean interval time between normal steps is about 16 μs, and the mean interval between dart steps is 6–8 μs. The amplitudes of leader pulses in Florida increase just prior to the return stroke, the largest usually being about 10% of the return stroke peak. In Arizona the leader pulse amplitudes are smaller than those in Florida, in relation to the return stroke, and are not as easy to identify. The shapes of the fields produced by normal steps are similar to dart steps, and the dart steps are very similar to regular sequences of pulses produced by many intracloud discharges. The 10–90% rise times of individual step wave forms are often less than 0.3 μs, and the full width at half maximum of a step pulse is typically 0.4–0.5 μs under conditions where the propagation distortion is minimal. The amplitudes and the shapes of leader step wave forms suggest that the peak step current is at least 2000–8000 A close to the ground and that the maximum rate of change of step current is 6–24 kA/μs or larger. A rough estimate of the minimum charge lowered during the formation of a step is (1–4) × 10−3 C." @default.
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- W1973553485 date "1977-02-20" @default.
- W1973553485 modified "2023-10-05" @default.
- W1973553485 title "The electric fields produced by lightning stepped leaders" @default.
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- W1973553485 doi "https://doi.org/10.1029/jc082i006p00951" @default.
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