Physical properties of radiation fields produced by multiple in-cloud lightning discharges

Citation
Bh. Lee et al., Physical properties of radiation fields produced by multiple in-cloud lightning discharges, JPN J A P 1, 40(1), 2001, pp. 299-306
Citations number
28
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Volume
40
Issue
1
Year of publication
2001
Pages
299 - 306
Database
ISI
SICI code
0021-4922(200101)40:1<299:PPORFP>2.0.ZU;2-A
Abstract
This paper describes some physical properties and statistical analyses of r adiation fields associated with multiple in-cloud lightning discharges. A w ide-band waveform recording system was employed to analyze the time-domain characteristics of the radiation fields. The radiation fields produced by i n-cloud lightning discharges were significantly different from cloud-to-gro und return stroke fields and showed pronounced bipolar pulse peak amplitude s comparable to those of cloud-to-ground return stroke fields. The time int ervals between the subsequent strokes for both the positive and negative ra diation fields decrease as the stroke order increases. The ratio of the pea k of the subsequent strokes to the first stroke peak is distributed over a wide range. Little difference was observed compared with the results for bo th the positive and negative polarities. The time intervals between the sup erimposing narrow stepwise pulses in the initial half-cycle of the pronounc ed bipolar pulse were in the range of less than 12 mus and the mean values for the positive and negative polarities were 4.33 mus and 4.78 mus. respec tively. The statistics on the parameters of the electric and magnetic field waveforms seem to provide a good quantitative estimate of the lightning pr otection device response to the electromagnetic pulse effects of in-cloud l ightning discharges.