Observation and study on the whole process of cloud-to-ground lightning using narrowband radio interferometer

查看全文 作　　者：ZHANG [1]GuangShu;ZHAO [1,3]YuXiang;QIE [2]XiuShu;ZHANG [1]Tong;WANG [1]YanHui;CHEN [1]ChengPin

机构地区：[1]Laboratory for Climate Environment and Disasters of Western China,Cold and Arid Regions Environmental and Engineering Re-search 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]Tianshui Normal College,Tianshui 741001,China

出　　处：《Science China Earth Sciences》索引2008年第51卷第5期,共15页

基　　金：the Knowledge Innovation Program of the Chinese Academy of Sci-ences (Grant No. KZCX2-YW-206-2);the National Natural Science Foundation of China (Grant No. 40775004);the National Science Fund for Distinguished Young Scholars (Grant No. 40325013) 摘　　要：A narrowband radio interferometer has been developed and used to locate the entire sources of VHF radiations from a negative cloud-to-ground (CG) lightning discharge which contains 19 strokes. This system uses five antennas to form an array consisting of short- and long-baselines along two or- thogonal directions. The system error which comes from frequency conversion is reduced by phase detection through direct high frequency amplifying. An interactive graphic analysis procedure is used to remove the fringe ambiguities which exist inherently in interferometry and to determine the direction of lightning radiation sources in two dimensions (azimuth and elevation) as a function of time at a time resolution of microsecond orders. With the developed system, the whole progression process in time and space of a lightning flash can be reconstructed. In this paper, combining the synchronous data of electric filed change and VHF radiation, the whole processes of an example negative CG flash have been studied in detail. It is found that the preliminary breakdown event of the CG flash started from negative charge region and exhibited firstly a downward pregression and then an upward propagation. There were very intense and continuous radiations during stepped leaders which became much stronger when the first return stroke began. In contrast, there were less and only discrete radiations during dart leaders. Stepped leader and dart leader may transform to each other depending on the state of the ionization of the path. The progression speed of initial stepped leaders was about 105 ms?1, while that was about 4.1×106 and 6.0×106 ms?1 for dart leaders and dart-stepped leaders, respectively. M events produced hook-shaped field changes accompanied by active burst of radiations at their begin- nings. Followed these active radiation processes, M events appeared to contact finally into conducting main discharge channels. The mean progression speed of M events was about 7×107 ms?1, greater than that of the dart leaders and dart-step leaders. K events and attempted leaders were essentially the same as dart leaders except that they could not reach the ground and initiate return strokes. 关键词：LIGHTNING NARROWBAND interferometer DART LEADER K EVENTS M EVENTS the WHOLE process of cloud-to-ground LIGHTNING

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Observation and study on the whole process of cloud-to-ground lightning using narrowband radio interferometer

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