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Using lightning locating system based on time-of-arrival technique to study three-dimensional lightning discharge processes

引用

Science china Earth sciences 2010年第4期53卷 591-602页

作者： zhang guangshu1,wang yanhui1,qie xiushu2,zhang tong1,zhao yuxiang1,3,li yajun1 & cao dongjie11 laboratory for climate environment and disasters of western china,cold and arid regions environmental and engineering research institute.chinese academy of sciences,lanzhou 730000.china 2 laboratory for Middle Atmosphere and Global environment Observation(LAGEO),institute of Atmospheric Physics,chinese academy of sciences,Beijing 100029,china 3 Department of Physics,Tianshui Normal College,Tianshui 741001,china laboratory for climate environment and disasters of western china Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou China laboratory for Middle Atmosphere and Global environment Observation (LAGEO) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Department of Physics Tianshui Normal College Tianshui China

A time-of-arrival(TOA) system based on GPS technology for locating VHF radiation sources from lightning has been developed and used in observation sites in the northern Shandong Province,*** 3D images of the lightning progression have been obtained successfully for the first time in *** 3D-channel evolutions of typical negative CG,positive CG and IC lightning flashes have been discussed together with the data of fast electric field *** was found that significant differences existed between the negative and positive CG lightning flashes in terms of the initiation and propagation of the radiation *** preliminary breakdown of a negative CG lightning flash propagated at a speed about 5.2×104 m/*** stepped leader of negative CG lightning flashes was trigged by negative initial ***,it propagated downward at a speed of 1.3×105 m/*** initial process of the positive CG lightning flashes was also a propagation process of negative *** streamers propagated dominantly horizontally in the positive charge region and accumulated positive charges at the origin of the lightning,and as a consequence,initiated downward positive streamers.A new type of lightning discharge that was triggered by a narrow bipolar pulse(NBP) is discussed in this *** NBP was originated at altitude of about 10.5 km in the upper positive charge *** a distinct difference from normal IC flash,its channels extended horizontally all around and produced a lot of radiation *** source power of the NBP could approach 16.7 kW,which is much greater than that of normal lightning discharge ranging between 100 mW and 500 *** 3D propagation of this new type of lightning discharge was observed and obtained for the first time in *** possible initiation mechanism of this new type of light-ning is discussed here.

关键词： time-of-arrival(TOA) technique three dimensional lightning locating system discharge process narrow bipolar pulse new-type of IC lightning

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