What occurs in K process of cloud flashes
What occurs in K process of cloud flashes
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DOI：
10.1029/2009jd012016
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发表时间：
2010-04
影响因子：
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通讯作者：
M. Akita;Y. Nakamura;S. Yoshida;T. Morimoto;T. Ushio;Z. Kawasaki;Daohong Wang
中科院分区：
文献类型：
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作者：
M. Akita;Y. Nakamura;S. Yoshida;T. Morimoto;T. Ushio;Z. Kawasaki;Daohong Wang
[1]大阪大学闪电研究小组一直在研制和改进VHF宽带数字干涉仪，它以极高的时间分辨率在三维空间定位闪电放电产生的脉冲VHF辐射源。由于2006-2007年澳大利亚达尔文季风季的甚高频观测，伴随着K过程的云闪电在高时间分辨率的三维上被清晰地显示出来。在云闪的后期，伴随着K变化的负反冲流沿与早期负击穿相同的通道传播。负反冲流光的速度比之前的负击穿快了两个数量级。负反冲流光应该是从正向击穿的尖端开始的，这些正向击穿沿着与之前相反方向的负向击穿相同的路径进行。
[1] The Lightning Research Group of Osaka University has been developing and improving the VHF broadband digital interferometer, which locates the impulsive VHF radiation sources caused by lightning discharges with extremely high time resolution in three dimensions. As a result of the VHF observations during the 2006–2007 monsoon season in Darwin, Australia, cloud flashes accompanied by K processes are clearly visualized in three dimensions with high time resolution. In the late stage of the cloud flashes, negative recoil streamers accompanied by K changes propagate along the same channels as that of preceding negative breakdowns in the early stage. The speeds of the negative recoil streamers are 2 orders of magnitude faster than the preceding negative breakdown. The negative recoil streamers are supposed to initiate from the tips of positive breakdowns that have progressed along the same path as previous negative breakdowns in the opposite direction.