Microsecond‐scale electric field pulses in cloud lightning discharges
Microsecond‐scale electric field pulses in cloud lightning discharges
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DOI：
10.1029/94jd01121
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发表时间：
1994-07
影响因子：
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通讯作者：
Y. Villanueva;V. Rakov;M. Uman;M. Brook
中科院分区：
文献类型：
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作者：
Y. Villanueva;V. Rakov;M. Uman;M. Brook
从宽带电场记录获得使用12位数字化系统与500纳秒的采样间隔，微秒尺度的脉冲在不同阶段的云闪在佛罗里达和新墨西哥州进行了分析。脉冲发生统计和波形特征。较大的脉冲往往出现在闪光的早期，证实了比尔斯等人（1988）的结果，并与北川和布鲁克（1960）提出的云放电电场的三阶段表示形成对比。可能的解释差异进行了讨论。较大的脉冲发生在云闪早期的趋势表明，它们与初始的云内通道形成过程有关，并与大气无线电噪声文献中发现的共同观点相矛盾，即云闪中VLF/LF电磁辐射的主要来源是发生在云放电的最后或J型部分的K过程。
From wideband electric field records acquired using a 12-bit digitizing system with a 500-ns sampling interval, microsecond-scale pulses in different stages of cloud flashes in Florida and New Mexico are analyzed. Pulse occurrence statistics and waveshape characteristics are presented. The larger pulses tend to occur early in the flash, confirming the results of Bils et al. (1988) and in contrast with the three-stage representation of cloud-discharge electric fields suggested by Kitagawa and Brook (1960). Possible explanations for the discrepancy are discussed. The tendency for the larger pulses to occur early in the cloud flash suggests that they are related to the initial in-cloud channel formation processes and contradicts the common view found in the atmospheric radio-noise literature that the main sources of VLF/LF electromagnetic radiation in cloud flashes are the K processes which occur in the final, or J type, part of the cloud discharge.