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66 acta meteorologica sinica vol.22 optical observations on propagation characteristics of leaders in cloud-to-ground lightning flashes (2007).
| Content Provider | CiteSeerX |
|---|---|
| Author | Weitaoy, Lu Yijun, Zhang Jun, Li Dong, Zheng Wansheng, Dong Shaodong, Chen Fei, Wang |
| Abstract | Using 2 high-speed cameras, we have recorded 14 negative cloud-to-ground (CG) lightning ashes, half of which are natural and the others are articially triggered. The two-dimensional (2D) propagation speed of dierent type leaders and the luminosity of lightning channel are analyzed in detail. Bidirectional leader processes are observed during the initial processes of two altitude triggered negative lightning (ATNL) ashes. The analysis shows: the propagation speed of the upward positive leader (UPL) before the initiation of the downward negative leader (DNL) is at the order of 104{105 m s1; the UPL can be intensied by the initiation and development of the DNL in the way that the luminosity is enhanced and the speed is sped up; after initiation, the DNL in one ATNL ash propagates downward three times intermittently with interval of about 1 ms, while that in the other ATNL ash propagates downward continuously with a speed at the order of 105 m s1. In the ve classical triggered negative lightning (CTNL) ashes, the propagation speeds of the UPLs vary between 0.35105 and 7.71105 m s1, and the variations of their luminosities and speeds are quite complex during the development processes. Among the four observed natural negative lightning ashes occurred on the land, three have only one return stoke (RS) each and all of their DNLs have many branches with an average speed at the order of 105 m s1; while the another one has 13 RSs. |
| File Format | |
| Publisher Date | 2007-01-01 |
| Access Restriction | Open |
| Subject Keyword | Optical Observation Acta Meteorologica Sinica Vol Cloud-to-ground Lightning Flash Propagation Characteristic Propagation Speed Atnl Ash Propagates Negative Lightning High-speed Camera Upward Positive Leader Downward Negative Leader Lightning Ash Bidirectional Leader Process Many Branch Negative Cloud-to-ground Upls Vary Average Speed Initial Process Return Stoke Natural Negative Lightning Ash Dierent Type Leader |
| Content Type | Text |
