Observation of Compact Intracloud Discharges using VHF broadband interferometer
Observation of Compact Intracloud Discharges using VHF broadband interferometer
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DOI：
10.1109/iclp.2012.6344211
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
W. Dong;Hengyi Liu
中科院分区：
文献类型：
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作者：
W. Dong;Hengyi Liu
密集云内放电（CID）是一种以强VHF辐射为特征的独特云内闪电放电，是最神秘的闪电事件之一。本文首次给出了利用VHF宽带干涉仪获得的CID信道演化图像。通过对11个城市传染病的分析表明，城市传染病的传播渠道主要是垂直方向的。CID的垂直尺度在0.40 - 1.9km之间。VHF宽带辐射的平均持续时间为15 μs。CID的平均视速度范围为0.44 ~ 1.0 × 108 m/s，平均值为0.61×108 m/s。CID的辐射源的时间-空间演变示出振荡图案，证实了先前的预测，即在CID通道的两端处反射振荡电流。计算结果表明，该通道中的海流波速度在0.56 ~ 2.6 × 108 m/s之间，平均值为1.4 × 108 m/s。
Compact Intracloud Discharges (CIDs) is a distinct intracloud lightning discharge characterized by strong VHF emissions, and one of the most mysterious lightning events. In this paper, the CIDs channel evolution images obtained by using VHF broadband interferometers are presented for the first time. Analysis of 11 CIDs shows that the channels of CIDs develop mainly in a vertical direction. The vertical scale of CIDs is in the range of 0.40 - 1.9 km. The average duration of VHF broadband emissions is 15 μs. The average apparent speed of CIDs is in a range of 0.44 - 1.0 × 108 m/s with a mean value of 0.61×108 m/s. The temporal-spatial evolution of the radiation sources of the CIDs shows an oscillation pattern, confirming the previous prediction that there is an oscillating current being reflected at the two ends of the CIDs channel. The estimated speed of the current wave in the CIDs channel is in a range of 0.56 - 2.6 × 108 m/s with a mean value of 1.4 × 108 m/s.