摘要
为了能够通过雷电辐射场信号反演闪电强度,利用500～800 km范围的VLF磁场数据和定位资料,分析了远距离磁场数据的波形特征,并对雷电流强度与磁场幅值的相关性进行了研究。将磁场数据按照距离衰减规律归一化至650 km后,结果表明:远距离雷电流强度与磁场幅值之间基本满足线性关系;对于地波,需要考虑地球曲率引起的衰减;一次天波同时受电离层特性和地磁场的影响,会表现出方向上的差异性。另外,拟合结果的准确性还一定程度上取决于数据本身的分布情况,地波数据更加集中,所以结果也更加可靠。
In order to invert the lightning intensity through the lightning radiation field signal,the VLF magnetic field data and positioning data in the range of 500~800 km were used to analyze the waveform characteristics of long-range magnetic field data and investigate the correlation between the lightning current intensity and the magnetic field amplitude.After normalizing the magnetic field data to 650 km according to the distance attenuation law,the results show that the long-distance lightning current intensity and the magnetic field amplitude basically satisfies the linear correlation.For the groundwave,it is necessary to consider the attenuation caused by earth curvature.The results of the first skywave show differences in direction because of the effects of ionosphere and earth magnetic field.In addition,the accuracy of the fitting results depends on the distribution of the data to some extent,and the groundwave data is more concentrated,so the results are more reliable.
作者
吴进成
张其林
候文豪
周仿荣
沈志
高振宇
WU Jincheng;ZHANG Qinlin;HOU Wenhao;ZHOU Fangrong;SHEN Zhi;GAO Zhenyu(Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster(CIC-FEM)/Key Laboratory for Aerosol-Cloud—Precipitation of China Meteorological Administration,Nanjing University of Information Science&Technology,Nanjing 210044,China;Electric Power Research Institute,Yunnan Power Grid Company Ltd.,Kunming 650217,China)
出处
《电瓷避雷器》
CAS
北大核心
2019年第2期32-40,46,共10页
Insulators and Surge Arresters
基金
国家自然科学基金联合资助(编号:41775006)
国家自然科学基金(编号:41575004)
关键词
电离层
电磁场
雷电流
地磁场
ionosphere
electromagnetic field
lightning current
earth magnetic field
