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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Underground Measurement of Magnetic Field Pulses During the Early Stage of Rocket-Triggered Lightning
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Underground Measurement of Magnetic Field Pulses During the Early Stage of Rocket-Triggered Lightning

机译：火箭触发闪电早期磁场脉冲的地下测量

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摘要

We examined the underground magnetic field near the lightning channel with low-frequency magnetic sensor based on SHAndong Triggering Lightning Experiment (SHATLE). Two sensors were deployed, one at 1-m height above ground and another one at 2-m depth underground at a distance of 78 m from the lightning channel, and the magnetic pulses during the initial stage of triggered lightning were recorded. The experimental results show that the microsecond-scale magnetic pulses radiated by the upward lightning leader can be detected in the subsurface space and the magnetic signal is modified by the soil medium. Specifically, the amplitude at the depth of 2 m is attenuated typically more than 55%, and the attenuation decreases as the timescale of the magnetic pulse increases; meanwhile, the peak time of the underground magnetic pulse is delayed by about 0.6 μs, and the half-peak width of the magnetic pulse is increased by 0.2-0.8 μs (namely, by 20% to 32%). The results of Fourier analysis indicate that the component with relatively high frequency is subject to more attenuation than is the component with relatively low frequency. In addition, the simulation of magnetic field with the channel-base current by using the transmission line model is consistent with the measurement, indicating that the modification on the waveform characteristics of the lightning pulse measured underground could provide valuable information for retrieving the electromagnetic parameters of soil.
机译：我们在山东触发闪电实验（Shatle）附近的雷电通道附近的地下磁场附近。展开了两个传感器，在地上的1米高的位置，另一个在从雷电通道的距离78μm的距离处的2米处，记录触发闪电初始阶段的磁脉冲。实验结果表明，在地下空间中可以检测向上闪电前导射线辐射的微秒磁脉冲，并且通过土壤介质修改磁信号。具体地，衰减2μm深度的幅度通常大于55％，并且随着磁脉冲的时间尺寸增加，衰减减小;同时，地下磁脉冲的峰值时间延迟约0.6μs，磁脉冲的半峰宽度增加0.2-0.8μs（即，×20％至32％）。傅立叶分析结果表明，具有相对高频率的组件受到比具有相对低频率相对低的组件的衰减。另外，通过使用传输线模型与通道基电流的磁场仿真与测量一致，指示在地下测量的雷击的波形特性的修改可以提供用于检索电磁参数的有价值的信息土壤。

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  • 作者

    Xiao Li; Gaopeng Lu; Yanfeng Fan; Rubin Jiang; Hongbo Zhang; Dongshuai Li; Mingyuan Liu; Yongping Wang; Huan Ren;

  • 作者单位

    Key Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China;

    Key Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China;

    State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing China;

    Key Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China;

    Key Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China;

    Instituto de Astrofisica de Andalucia-CSIC Granada Spain;

    Key Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China;

    School of Earth and Space Sciences University of Science and Technology of China Hefei China;

    Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Nanjing Jiangsu China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

    Underground; Measurement; Magnetic;

    机译：地下;测量;磁性;

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