Lightning detection with 3‐D discrimination of intracloud and cloud‐to‐ground discharges
Lightning detection with 3‐D discrimination of intracloud and cloud‐to‐ground discharges
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DOI：
10.1029/2004gl019821
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发表时间：
2004-06
影响因子：
5.2
通讯作者：
H. Betz;K. Schmidt;P. Oettinger;M. Wirz
中科院分区：
文献类型：
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作者：
H. Betz;K. Schmidt;P. Oettinger;M. Wirz
为了便于区分云内闪电和云对地闪电，研究人员开发了一种新技术，可以在伪三维模式下操作空间扩展的VLF/LF闪电检测网络。采用高精度的到达时间测量，分别在高海拔地区和近地地区区分闪电放电的VLF/LF发射区。这是通过利用靠近闪电事件的传感器站测量到的到达时间与基于二维传播路径的预期到达时间的偏差来实现的。该方法要在共维网络中成功运行，需要同时实现信号处理和事件时间标注，精度水平约为1 μs。结果来自一个自2003年5月以来连续运行的新网络，覆盖了德国东南部约300 × 400公里的区域。已确定VLF/LF源发射高度为~ 5-15 km。
A new technique has been developed to operate spatially extended VLF/LF lightning detection networks in a pseudo 3‐D mode in order to facilitate discrimination of intra‐cloud and cloud‐to‐ground lightning. Time‐of‐arrival measurements are carried out with high precision to distinguish VLF/LF‐emission regions of lightning discharges in higher altitudes and near ground, respectively. This is accomplished by utilizing deviations of arrival times measured at sensor stations close to lightning events as compared to arrival times expected on the basis of 2‐D propagation paths. Successful functioning of the method in networks of common dimensions requires that both signal processing and event time tagging is achieved with an accuracy level of about 1 μs. Results are presented from a new network which has been operating continuously since May 2003 and covers southeast Germany in an area of approximately 300 × 400 km. VLF/LF source emission heights of ∼5–15 km have been identified.