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Lightning-Channel Morphology Revealed by Return-Stroke Radiation Field Waveforms

机译:回击 - 辐射场波形揭示的雷电通道形态

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Simultaneous video and wideband-electric-field recordings of 32 cloud- to-groundlightning flashes in Florida were analyzed to show that the formation of new channels to ground can be detected by examination of the return-stroke radiation fields alone. The return-stroke E and dE/dt waveforms were subjectively classified according to their fine structure. Then the video images were examined field-by-field to identify each waveform with a visible channel to ground. 55 correlated waveforms and channel images were obtained. Of these, all 34 first-stroke waveforms (multiple jagged E peaks; noisy dE/dt), 8 of which were not radiated by the chronologically first stroke in the flash, came from new channels to ground (not previously seen on video). All 18 subsequent-stroke Waveforms (smoothly rounded E and quiet dE/dt after the initial peak) were radiated by old channels (illuminated by a previous stroke).

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