地面电导率对地闪回击辐射场传输的影响  

Effect of the Infinite Conducting Earth on the Lightning-generated Electric Field

作　　者：张其林[1,2] 郄秀书[3] 王振会[1] 杨仲江[1,2] 李霞[1,2] 施广全[1,2] 

机构地区：[1]南京信息工程大学江苏省气象灾害重点实验室,南京210044 [2]南京信息工程大学遥感学院雷电科学与技术系,南京210044 [3]中国科学院大气物理研究所中层大气与全球环境探测实验室,北京100029

出　　处：《高电压技术》2008年第10期2036-2040,共5页High Voltage Engineering

基　　金：江苏省气象灾害重点实验室(南京信息工程大学)项目(KLME050101)~~

摘　　要：为了探讨地闪回击辐射场沿有限电导率σ地表面的传播特性,用表面波理论,结合地闪回击过程的推迟势效应,分析讨论了时域和频域地闪回击辐射场沿不同σ地表面的传播特性(如湿地、干地、湖泊和沙漠)。结果表明,远距离地表面附近的辐射场主要是表面波,表面波强度与距离的平方成反比。地面σ对地闪回击辐射场传输存在较大的影响,σ越小,影响越大,回击辐射场沿不同σ地表面的传播并不是按照距离反比关系衰减。In order to investigate the influences of the path of propagation on the amplitude of the electric fields generated by lightning return stroke, based on the lateral-wave theory and the retardation effects, the propagation effects on the lightning-generated electric field along the imperfectly conducting earth such as wet and dry earth, lake water and dry sand are calculated. It is shown that the field on the earth＇s surface is determined primarily by the lateral surface wave with an inverse distance square relationship since the space vanishes there. The radiation field along the surface of low conducting ground is significantly affected by popagation, the far field incident on the earth boundary in time domain and frequent domain does not decrease inversely with increasing distance over a wide range of media.

关 键 词：有限电导率 辐射场 表面波 回击 电场 影响 

分 类 号：P427.3[天文地球—大气科学及气象学]