Localization of Thunder Source and Reconstruction of Lightning Channel Geometry Using Sound Data
Thunder waves generated by lightning ground and cloud flashes are considered to be one of strong natural sound source.Even though the strongest thunder signatures are generated at the return stroke stage, thunder signals generated at other events also can be strong enough to record using a sensitive system.In this study, it was attempted to construct the channel geometry of cloud and ground flashes by locating the temporal and spatial variation of thunder sources.The system was consisted of 3 Bruel & Kjaer type 4198 prepolarized, free field microphones placed at difference locations.A mathematical model using the time of arrival method was developed to calculate the location of thunder sources.Five lightning flashes were reconstructed using the recorded thunder signatures.Possible effects that can cause by atmospheric conditions were neglected.However, numerical calculations suggest that the possible error on the location due to miscalculations of time is less than 2％.Accuracy of the calculations can be improved by increasing the number of microphones.Therefore, we suggests that the thunder signal generated by lightning ground and cloud flashes could be used to study the channel geometry of lightning.
Bodhika J.A.P. Dharmarathne W.G.D. Mahendra Fernando Vernon Cooray
Department of Physics,University of Ruhuna,Sri Lanka Department of Physics,University of Colombo,Sri Lanka Division of Electricity and Lightning Research,Angstrom Laboratory,University of Uppsala,Sweden
国际会议
成都
英文
1-7
2011-11-01（万方平台首次上网日期，不代表论文的发表时间）