| 人工引雷上行正先导传播过程中爆发式磁场脉冲极性反转现象的观测与分析 |
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| 引用本文： | 郑天雪,陆高鹏,谭涌波,樊艳峰,蒋如斌,张鸿波,刘明远,郄秀书.人工引雷上行正先导传播过程中爆发式磁场脉冲极性反转现象的观测与分析[J].大气科学,2018,42(1):124-133. |
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| 作者姓名： | 郑天雪 陆高鹏 谭涌波 樊艳峰 蒋如斌 张鸿波 刘明远 郄秀书 |
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| 作者单位： | 1.南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室, 南京 210044 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）项目2014CB441405，中国科学院“百人计划”项目2013068，国家自然科学基金优秀青年基金项目41622501 |
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| 摘 要： | 为了进一步理解人工引雷上行正先导的传播过程及相关的爆发式电磁辐射脉冲，本文分析了2014年8月23日山东沾化人工触发闪电实验（SHATLE）中获得的三次上行正先导通道含有明显向下传播过程的个例。结果表明，在初始连续电流阶段观测到的爆发式磁场脉冲极性反转现象与正先导头部发展方向相对于观测位置投影方向的变化密切相关。因此可以推断，爆发式磁场脉冲是由正先导头部较小空间尺度放电过程辐射出的，就本文分析的个例而言，爆发式磁场脉冲辐射源的放电尺度约为2 m，放电强度的最大值达到2.49 kA。爆发式磁场脉冲的辐射机制不同于人工引雷先导始发阶段初始脉冲电流产生的磁场脉冲的辐射机制，可能与正先导通道头部的梯级形式发展过程相关。
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| 关 键 词： | 人工引雷 正极性上行先导 初始连续电流 爆发式磁场脉冲 极性反转 |
| 收稿时间： | 2017/1/23 0:00:00 |
Observation and Analysis of Polarity Reversal for the Burst-type Magnetic Pulses during the Propagation of Upward Positive |
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| ZHENG Tianxue,LU Gaopeng,TAN Yongbo,FAN Yanfeng,JIANG Rubin,ZHANG Hongbo,LIU Mingyuan and QIE Xiushu.Observation and Analysis of Polarity Reversal for the Burst-type Magnetic Pulses during the Propagation of Upward Positive[J].Chinese Journal of Atmospheric Sciences,2018,42(1):124-133. |
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| Authors: | ZHENG Tianxue LU Gaopeng TAN Yongbo FAN Yanfeng JIANG Rubin ZHANG Hongbo LIU Mingyuan and QIE Xiushu |
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| Institution: | 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 Disasters(CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & amp;Technology, Nanjing 210044,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 Disasters(CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & amp;Technology, Nanjing 210044;Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100049,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 Disasters(CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & amp;Technology, Nanjing 210044,University of Chinese Academy of Sciences, Beijing 100049,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 Disasters(CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & amp;Technology, Nanjing 210044;Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100049,University of Chinese Academy of Sciences, Beijing 100049,Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100049 and 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 Disasters(CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & amp;Technology, Nanjing 210044;Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100049 |
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| Abstract: | In order to understand the propagating process of upward positive leader and related burst-type electromagnetic pulses,in this paper we analyze three cases of downward propagation of positive leader channels obtained by SHATLE (SHAndong Triggering Lightning Experiment) on August 23,2014.The results show that the reversals in the polarity of magnetic pulses observed in the stage of initial continuous current are related to the variation of projection direction of positive leader head relative to the observation position.Thereby it can be inferred that the burst-type magnetic pulses are emitted by small spatial scale discharge process of positive leader head.For the cases analyzed in this paper,the discharge scale is about 2 m,and the maximum discharge intensity reaches 2.49 kA.The radiation mechanism for these magnetic pulses is different to the radiation mechanism for the magnetic pulses generated by the initial pulse current in the channel measured at the initial stage of rocket-triggered lightning,which may be related to the stepped propagation of positive leader. |
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| Keywords: | Artificially triggered lightning Upward positive leader Initial continuous current Burst-type magnetic pulses Polarity reversal |
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