青藏高原东北部双极性窄脉冲放电物理参数模型反演  

Inversion of physical parameters of bipolar narrow pulse discharge in the northeastern Qinghai-Tibet Plateau

作　　者：王彦辉 刘亚栎 金旺 闵应昌 刘银萍[1] 赵果[3] WANG Yanhui;LIU Yali;JIN Wang;MIN Yingchang;LIU Yinping;ZHAO Guo(Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China;College of Physics and Electronic Engineering,Qujing Normal University,Qujing 655011,China;Public Technical Service Center,Northwest Institute of Eco-Environmental Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室/气象灾害预报预警与评估协同创新中心,南京210044 [2]曲靖师范学院物理与电子工程学院,曲靖655011 [3]中国科学院平凉陆面过程与灾害天气观测研究站西北生态环境资源研究院公共技术服务中心,兰州730000

出　　处：《电波科学学报》2022年第6期1007-1018,共12页Chinese Journal of Radio Science

基　　金：国家重点研发计划(2017YFC1501502);第二次青藏高原科考项目(2019QZKK0104);国家自然科学基金(41675006,41875002)。

摘　　要：利用青藏高原东北部青海地区三维定位数据和双极性窄脉冲电场波形同步数据,基于三种模型和粒子群优化算法,拟合并反演了双极性窄脉冲放电通道中电流峰值、通道尺度等特征参数,统计分析了不同传输线模型拟合得到的双极性窄脉冲的物理参数.结果表明:在基于流光-先导的准静电场传统空气热击穿机制的TL模型和MTLK模型中,相比TL模型,MTLK模型考虑了电流传输过程中能量的损耗,更符合实际;而基于准静电场相对逃逸雪崩击穿机制的MTLEI模型,相比较另两种传输线模型,表现为更窄放电通道内存在长时间随着高度呈指数递增的电流强度.三种传输线模型反演得到的电偶极矩范围为100~800 C·m,而更高处发生的双极性窄脉冲事件(narrow bipolar event,NBE)通常具有更大电偶极矩.The three-dimensional coordinates are calculated by using the synchronous electric field waveform data of narrow bipolar pulse,which are detected at Qinghai region in the northeast of Qinghai-Tibet Plateau.Based on the three different transmission line models and the particle swarm optimization algorithm,we fit the narrow bipolar pulses,and statistically analyze those physical quantities such as current amplitude and the length of the discharge channel.The main results of this paper are as follows:(1)compared with the standard transmission line(TL)model and the modified transmission line model with Kumaraswamy distribution of current(MTLK),the current characteristics fitted with the modified transmission line model(MTLEI)with a current that increases exponentially along the propagation are characterized by longer rising edge time and current duration.Meanwhile,the MTLEI model has the larger current peak range(185.8-837.5 kA)than other two models.(2)Compared with the TL model,the current rising edge time obtained by the MTLK model fitting is longer,the falling edge time is slightly lower,and the duration is longer.The MTLK model fits the parameters obtained for NBEs.In the median value(the peak current is 120 kA,the current channel length is 678 m,and the current speed is 2.05×10^(8) m/s)is slightly larger than the TL Model(the peak current is 94.3 kA,the length of the current channel is 491.1 m,and the current speed is 1.68×10^(8) m/s).However,the MTLK model considers the consumption during current transmission,which is closer to reality.(3)The electric dipole moments obtained by the inversion of the three transmission line models range from 100 to 800 C·m,and the NBE that occurs at a higher position generally has a larger electric dipole moment.

关 键 词：甚高频 双极性窄脉冲事件(NBE) 到达时间差法 粒子群算法 

分 类 号：P427.3[天文地球—大气科学及气象学]