Close View of the Lightning Attachment Process Unveils the Streamer Zone Fine Structure
Close View of the Lightning Attachment Process Unveils the Streamer Zone Fine Structure
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DOI：
10.1029/2022gl101482
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发表时间：
2022-12
影响因子：
5.2
通讯作者：
M. Saba;D. R. D. da Silva-D.-R.-D.-da-Silva-2196437034;J. Pantuso;C. D. da Silva
中科院分区：
文献类型：
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作者：
M. Saba;D. R. D. da Silva-D.-R.-D.-da-Silva-2196437034;J. Pantuso;C. D. da Silva
一个非常近距离的高速视频观察闪电附着到建筑物揭示了新的细节，关于领导流光区动态。向上的先导以稳定和不分枝的方式传播，显示均匀发光的电晕刷。例外情况是连接前的向上连接先导（UCL），此时其流注区的大小增加，并形成一个更连续的模式。向下的负先导具有从每个负先导尖端发出的3米长的多个拖缆。在某些情况下，被称为空间茎的等离子体形成被认为是在先前被负流光占据的位置形成的。空间茎的光度与主先导通道相当，但与主先导通道的距离为4米。一些空间茎显示它们自己的流光，包括流光从两端发出的情况。空间茎的形成阻碍了离UCL最近的负前导序列的传播。
A very close high‐speed video observation of lightning attachment to a building revealed novel details regarding the leader streamer zone dynamics. Upward leaders propagate in a steady and unbranched manner, displaying a uniformly luminous corona brush. The exception being the upward connecting leader (UCL) just before connection, when its streamer zone increases in size and develops a more filamentary pattern. Downward negative leaders have 3‐m long multiple streamers emanating from each negative leader tip. On some occasions, plasma formations known as space stems are seen to form in the location previously occupied by negative streamers. Space stems have luminosities comparable to the main leader channel, but are detached from it by 4 m. Some space stems display streamers of their own, including cases where streamers are emanating from both ends. The space stem formation hampered the propagation of the negative leader that was closest to the UCL.