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Characterization of vertical electric fields 500 m and 30 m from triggered lightning
University of Florida, Gainesville, USA.
Swiss Federal Institute of Technology, Lausanne, Switzerland.
University of Florida, Gainesville, USA.
University of Florida, Gainesville, USA.
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1995 (English)In: Journal of Geophysical Research - Atmospheres, ISSN 2169-897X, E-ISSN 2169-8996, Vol. 100, no D5, p. 8863-8872Article in journal (Refereed) Published
Abstract [en]

Vertical electric field waveforms of leader-return stroke sequences measured 500 m and 30 m from rocket-triggered lightning are presented. The 500-m data were recorded during the summer of 1986, the 30-m data during the summer of 1991, both at the NASA Kennedy Space Center, Florida. The 40 leader-return stroke field waveforms at 500 m and the 8 waveforms at 30 m all appear as asymmetrical V-shaped pulses, the bottom of the V being associated with the transition from the leader to the return stroke. Only two waveforms at 30 m were suitable for quantitative analysis. The widths of the V at half of peak value for these are 1.8 and 5.0 ÎŒs, while for the 500-m data they are 1 to 2 orders of magnitude greater, with a median value of 100 ÎŒs. Applying a widely used and simple leader model to the measured leader electric fields at 500 m, we infer, for the bottom kilometer or so of the leader channel, leader speeds between 2×106 and 2×107 m/s and leader charges per unit length of 0.02×10−3 to 0.08×10−3 C/m. From the two measured leader electric field changes at 30 m we infer, using the same leader model, for the bottom 100 meters or so of the leader channel, speeds of 3×107 and 1×107 m/s (the corresponding measured waveform half widths are 1.8 ÎŒs and 5.0 ÎŒs) and charges per unit length of 0.14×10−3 and 0.02×10−3 C/m (the corresponding measured leader field changes are 81 kV/m and 12 kV/m). The corresponding measured return stroke peak currents for the above two cases are 40 kA and 7 kA, respectively. A positive correlation is observed between the magnitude of the leader field change at 500 m and the ensuing return stroke current peak.

Place, publisher, year, edition, pages
1995. Vol. 100, no D5, p. 8863-8872
Keywords [en]
Lightning, Electromagnetic Compatibility
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-238764DOI: 10.1029/95JD00213OAI: oai:DiVA.org:kth-238764DiVA, id: diva2:1262294
Available from: 2018-11-10 Created: 2018-11-10 Last updated: 2018-11-21Bibliographically approved

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Publisher's full texthttps://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/95JD00213
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Other Electrical Engineering, Electronic Engineering, Information Engineering

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