Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/661328
Title: Two basic leader connection scenarios observed in negative lightning attachment process
Authors: Weitao Lu;Qi Qi;Ying Ma;Luwen Chen;Xu Yan;Vladimir A. Rakov;Daohong Wang;Yijun Zhang
subject: multiple DL branches|upward connecting leader|leader connecting behaviour|type III behaviour|lateral surface|type I behaviour|attachment process|UCL|downward negative lightning flashes|basic leader connection scenarios|high-speed video images|type II behaviour|downward leaders
Year: 2016
Publisher: IEEE
Abstract: High-speed video images of 24 downward negative lightning flashes terminating on tall structures in Guangzhou are selected to analyse the connecting behaviour of the downward and upward leaders during the attachment process preceding the first return stroke. Three types of leader connecting behaviour have been observed: Type I, the tip of downward leader (DL) to the tip of upward connecting leader (UCL), which accounts for 42% of all the events (10/24); Type II, the DL's tip to the lateral surface of UCL, which accounts for 50% (12/24); and Type III, the combination of Types I and II, which accounts for 8% (2/24). For the two cases of Type III behaviour, each case had two junction points (one with Type I and the other with Type II behaviour) between the downward and upward leaders. Therefore, Types I and II can be viewed as the two basic types of the leader connecting behaviour during the attachment process in negative lightning. No attachment process exhibited the connection of the UCL's tip to the lateral surface of DL. The presence of multiple DL branches and their integrated effect on the development of positive UCL/UCLs are likely to be the main reasons for the Type II behaviour.
Description: 
URI: http://localhost/handle/Hannan/181098
http://localhost/handle/Hannan/661328
ISSN: 2397-7264
volume: 1
issue: 1
Appears in Collections:2016

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Title: Two basic leader connection scenarios observed in negative lightning attachment process
Authors: Weitao Lu;Qi Qi;Ying Ma;Luwen Chen;Xu Yan;Vladimir A. Rakov;Daohong Wang;Yijun Zhang
subject: multiple DL branches|upward connecting leader|leader connecting behaviour|type III behaviour|lateral surface|type I behaviour|attachment process|UCL|downward negative lightning flashes|basic leader connection scenarios|high-speed video images|type II behaviour|downward leaders
Year: 2016
Publisher: IEEE
Abstract: High-speed video images of 24 downward negative lightning flashes terminating on tall structures in Guangzhou are selected to analyse the connecting behaviour of the downward and upward leaders during the attachment process preceding the first return stroke. Three types of leader connecting behaviour have been observed: Type I, the tip of downward leader (DL) to the tip of upward connecting leader (UCL), which accounts for 42% of all the events (10/24); Type II, the DL's tip to the lateral surface of UCL, which accounts for 50% (12/24); and Type III, the combination of Types I and II, which accounts for 8% (2/24). For the two cases of Type III behaviour, each case had two junction points (one with Type I and the other with Type II behaviour) between the downward and upward leaders. Therefore, Types I and II can be viewed as the two basic types of the leader connecting behaviour during the attachment process in negative lightning. No attachment process exhibited the connection of the UCL's tip to the lateral surface of DL. The presence of multiple DL branches and their integrated effect on the development of positive UCL/UCLs are likely to be the main reasons for the Type II behaviour.
Description: 
URI: http://localhost/handle/Hannan/181098
http://localhost/handle/Hannan/661328
ISSN: 2397-7264
volume: 1
issue: 1
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7510497.pdf603.62 kBAdobe PDFThumbnail
Preview File
Title: Two basic leader connection scenarios observed in negative lightning attachment process
Authors: Weitao Lu;Qi Qi;Ying Ma;Luwen Chen;Xu Yan;Vladimir A. Rakov;Daohong Wang;Yijun Zhang
subject: multiple DL branches|upward connecting leader|leader connecting behaviour|type III behaviour|lateral surface|type I behaviour|attachment process|UCL|downward negative lightning flashes|basic leader connection scenarios|high-speed video images|type II behaviour|downward leaders
Year: 2016
Publisher: IEEE
Abstract: High-speed video images of 24 downward negative lightning flashes terminating on tall structures in Guangzhou are selected to analyse the connecting behaviour of the downward and upward leaders during the attachment process preceding the first return stroke. Three types of leader connecting behaviour have been observed: Type I, the tip of downward leader (DL) to the tip of upward connecting leader (UCL), which accounts for 42% of all the events (10/24); Type II, the DL's tip to the lateral surface of UCL, which accounts for 50% (12/24); and Type III, the combination of Types I and II, which accounts for 8% (2/24). For the two cases of Type III behaviour, each case had two junction points (one with Type I and the other with Type II behaviour) between the downward and upward leaders. Therefore, Types I and II can be viewed as the two basic types of the leader connecting behaviour during the attachment process in negative lightning. No attachment process exhibited the connection of the UCL's tip to the lateral surface of DL. The presence of multiple DL branches and their integrated effect on the development of positive UCL/UCLs are likely to be the main reasons for the Type II behaviour.
Description: 
URI: http://localhost/handle/Hannan/181098
http://localhost/handle/Hannan/661328
ISSN: 2397-7264
volume: 1
issue: 1
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7510497.pdf603.62 kBAdobe PDFThumbnail
Preview File