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Leader characteristics in positive cloud-to-ground lightning flashes
| Content Provider | Semantic Scholar |
|---|---|
| Author | Schumann, Carina Saba, Marcelo M. F. Campos, Leandro Z. S. Silva, Rodrigo Barros Da Schulz, Wolfgang |
| Copyright Year | 2011 |
| Abstract | Past results from streak photographs by Berger and Vogelsanger [1] show that there may be no steps on the positive leader propagation. Steps in positive leader propagation have never been observed by high speed cameras with frame rates up to 8000 frames per second [2]. However some other studies found pulses on the electric field during the progression of the leader toward ground that could indicate the presence of steps in the leader propagation. Hojo et al.[3] observed electric field leader pulses in 26-30% of their cases, with mean time interval of about 17μs (ranging from 3μs to 31μs). Proctor [4] observed two out of 175 flashes in South Africa that show pulses on the leader. Cooray and Lundquist [5] reported step pulses within a mean time interval of 26μs for positive lightning in Sweden. This work presents high-speed video camera and electric field measurements of downward leaders in positive cloud-to-ground lightning in Brazil. Several cases were analyzed and the percentage of leaders containing pulses is reported. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.aldis.at/fileadmin/user_upload/aldis/publication/2011/4_ISWL2011_Schumann.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
