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Correlated Sub-microsecond E-field and High-Speed Image of the Natural Lightning Attachment Process
Technical Paper
2001-01-2882
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A correlated high-speed image and E-field observation of natural lightning attachment process on a time scale of sub-microsecond has been performed. In one of the observed events, downward stepped leader pulses can be clearly identified either in E-filed or optical signals. When the stepped leader approaches within about three hundred meters of ground, optical pulses begin to appear in the lowest 40 m channel section. These pulses have larger amplitude than the pulses from the downward stepped leader. It appears that these pulses are produced by an upward connecting leader. These facts suggest that the upward connecting leader is also stepped and it could produce even stronger pulses than the corresponding downward leader. The downward stepped leader has a velocity of about 4x106 m/s, while the upward leader has the velocity of about 1.7x106 m/s. The return stroke pulses observed in the E-field and in the optical signal agree well in time but differ in fine structures. A fast transition can be clearly identified in the E-field return stroke pulse, but not in the optical pulse. The return stroke has a velocity of about 1.5X108 m/s. Based on these observed results, a model has been proposed to explain the slow front and the fast transition observed in the return stroke E-field fine structure.
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Authors
- D. Wang - Department of Electrical and Electronic Engineering, Gifu University, Japan
- M. Chen - Department of Electrical and Electronic Engineering, Gifu University, Japan
- N. Takagi - Department of Electrical and Electronic Engineering, Gifu University, Japan
- T. Watanabe - Department of Electrical and Electronic Engineering, Gifu University, Japan
Citation
Wang, D., Chen, M., Takagi, N., and Watanabe, T., "Correlated Sub-microsecond E-field and High-Speed Image of the Natural Lightning Attachment Process," SAE Technical Paper 2001-01-2882, 2001, https://doi.org/10.4271/2001-01-2882.Also In
References
- Berger, K. Novel observations on lightning discharges J.Franklin Inst. 283 478 525 1967
- Chen M. Takagi N. Watanabe T. Wang D. Kawasaki Z-I. Liu X. Spatial and temporal properties of optical radiation produced by stepped leader J.Geophys.Res. 104 27573 27584 1999
- Idone, V.P. Length bounds for connecting discharges in triggered lightning subsequent strokes J.Geophys.Res. 95 20409 20416 1990
- Jordan, D.M. Uman M.A. Variation in light intensity with height and time from subsequent lightning return strokes J. Geophys. Res. 88 6555 6562 1983
- Orville, R.E. Idone V.P. Lightning leader characteristics in the Thunderstorm Research International Program (TRIP) J.Geophys.Res. 87 11177 11192 1982
- Uman, M.A. McLain D.K. Fisher R.J. Krider E. P. Currents in Florida lightning return strokes J. Geophys. Res. 78 3530 3537 1973
- Uman, M.A. The lightning discharge Academic San Diego, Calif. 1987
- Wang, D. Rakov V.A. Uman M.A. Takagi N. Watanabe T. Crawford D.E. Rambo K.J. Schnetzer G.H. Fisher R.J. Kawasaki Z-I. Attachment process in rocket-triggered lightning strokes J. Geophys. Res. 104 2143 2150 1999
- Wang D. Takagi N. Watanabe T. Rakov V.A. Uman M.A. Observed leader and return-stroke propagation characteristics in the bottom 400 m of a rocket-triggered lightning channel J.Geophys.Res. 104 14369 14376 1999
- Weidman, C. D. Krider E.P. The fine structure of lightning return stroke waveforms J.Geophys.Res. 83 6239 6247 1978