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Estimation of channel characteristics of narrow bipolar events based on the transmission-line model
University of Science and Technology of China, Hefei, Anhui, China.
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2010 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 115, no 19, D19105- p.Article in journal (Refereed) Published
Abstract [en]

Narrow bipolar event (NBE) is a distinct class of intracloud lightning discharge, which is associated with the strongest radio frequency emissions and produces typical narrow bipolar radiation field waveforms. On the basis of the transmission-line model, we introduce a direct technique to measure the time taken by the current front to propagate along the channel from distant radiation field pulses; the channel length of the NBE can then be estimated by multiplying this time by an assumed propagation speed. Our method involves integrating over the initial half cycle of narrow bipolar waveform of the NBE. The ratio of the integral result to the initial peak amplitude makes a good approximation to the time taken by the current front to travel along the channel, even though the current amplitude suffers heavy attenuation along the propagating channel. This method can be applied to all NBEs which produce narrow bipolar radiation field waveforms. Besides, if both the far radiation field and the near-electrostatic field measurements were available, one could combine the method here and that of Eack (2004) to obtain the channel length of the NBE.

Place, publisher, year, edition, pages
2010. Vol. 115, no 19, D19105- p.
Keyword [en]
Bipolar radiation, Channel characteristics, Channel length, Current amplitude, Electrostatic field measurements, Half cycle, Intracloud, Lightning discharge, Narrow bipolar events, Peak amplitude, Propagation speed, Radiation field, Radio frequency emissions, Transmission line models, Wave forms
National Category
Meteorology and Atmospheric Sciences
URN: urn:nbn:se:kth:diva-149730DOI: 10.1029/2009JD012021ISI: 000282507500001ScopusID: 2-s2.0-77957726628OAI: diva2:741760

QC 20140829

Available from: 2014-08-29 Created: 2014-08-26 Last updated: 2014-08-29Bibliographically approved

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Zhou, Helin
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