Some properties of em radiation from lightning
Some properties of em radiation from lightning
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DOI：
10.1029/jc084ic02p00719
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发表时间：
1979-02
影响因子：
--
通讯作者：
R. Clegg;E. M. Thomson
中科院分区：
文献类型：
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作者：
R. Clegg;E. M. Thomson
同时记录了斐济苏瓦发生的地面闪电和云闪产生的静电场、光学辐射和高频(10 MHz)辐射，并分析了闪电放电产生的高频辐射的空隙(短暂中断)。回击后高频噪声中的间隙似乎被K变化所终止，间隙持续时间分布与先前观察到的K变化间隔分布密切相关。这些观测结果支持这样的猜测，即云内连接流光不是在回击后立即停止，而是从回击通道的顶部继续进行，直到敲击一袋电荷产生K变化，从而终止噪声间隙。据推测，流光本身只会微弱地辐射HF。早些时候提出的持续时间大于一定长度的高频噪声间隙与回击有关，因此可以用于闪电计数目的来区分云-地放电和声内放电，这一提议不被支持。
Simultaneous records of electrostatic fields and optical and HF (10 MHz) radiation from ground and cloud flashes occurring in Suva, Fiji, have been made, and gaps (brief cessations) in the HF radiation from lightning discharges have been analyzed. Gaps in the HF noise following return strokes appear to be terminated by K changes, the gap duration distribution following closely that of previously observed K change interval distributions. These observations support conjecture that in-cloud junction streamers, rather than ceasing immediately following a return stroke, proceed from the top of the return stroke channel until a pocket of charge is tapped to produce the K change which terminates the noise gap. The streamer itself is presumed to radiate HF only weakly. Earlier proposals that HF noise gaps of duration greater than a certain length are associated with return strokes and therefore can be used to discriminate, for lightning counting purposes, between cloud-ground discharges and intracloud discharges are not supported.