Characteristics and simulation of lightning current waveforms during one artificially triggered lightning |
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| Authors: | Q Zhang X Qie Z Wang T Zhang Y Zhao J Yang X Kong |
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| Institution: | 1. College of Remote Sensing, Nanjing University of Information Science and Technology, Nanjing 210044, PR China;2. Laboratory for Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, PR China;3. Laboratory for Climate Environment and Disasters of Western China,Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, PR China |
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| Abstract: | In the summer of 2005, one negative lightning flash was artificially triggered in Shandong Province (117°48′ E, 37°42′N), middle latitude region of eastern China. The flash included 10 return strokes, and the geometric mean value of the current peak was 11.9 kA (the average value was 12.6 kA) with a maximum of 21.0 kA and a minimum of 6.6 kA, similar to the subsequent return strokes in natural lightning. The geometric mean value of half peak width was 39 μs (the average value was 40 μs), which was much larger than the usual result. Based on the Diendorfer and Uman (DU) model, the return-stroke current waveforms and charge distribution along the lightning channel are discussed. The simulated current waveforms, being divided into breakdown and corona current components, are in agreement with the optical measurements when the two different discharge time constants are properly chosen. |
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| Keywords: | Artificially triggered lightning Discharge current Numerical simulation Charge distribution |
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