dc.contributor | Instituto Nacional de Pesquisas Espaciais (INPE) | |
dc.contributor | University of Arizona | |
dc.contributor | ZT Res | |
dc.contributor | Universidade Estadual Paulista (Unesp) | |
dc.date.accessioned | 2014-05-20T13:27:56Z | |
dc.date.accessioned | 2022-10-05T13:24:21Z | |
dc.date.available | 2014-05-20T13:27:56Z | |
dc.date.available | 2022-10-05T13:24:21Z | |
dc.date.created | 2014-05-20T13:27:56Z | |
dc.date.issued | 2008-04-01 | |
dc.identifier | Geophysical Research Letters. Washington: Amer Geophysical Union, v. 35, n. 7, p. 5, 2008. | |
dc.identifier | 0094-8276 | |
dc.identifier | http://hdl.handle.net/11449/9261 | |
dc.identifier | 10.1029/2007GL033000 | |
dc.identifier | WOS:000254716400002 | |
dc.identifier | WOS000254716400002.pdf | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/3885675 | |
dc.description.abstract | Based on analyses of high-speed video recordings of cloud-to-ground lightning in Brazil and the USA, the characteristics of positive cloud-to-ground (+CG) leaders are presented. The high frame rates permitted the average, 2-dimensional speeds of development along the paths of the channels to be resolved with good accuracy. The values range from 0.3 to 6.0 x 10(5) ms(-1) with a mean of 2.7 x 10(5) ms(-1). Contrary to what is usually assumed, downward +CG leader speeds are similar to downward -CG leader speeds. Our observations also show that the speeds tend to increase by a factor of 1.1 to 6.5 as they approach the ground. The presence of short duration, recoil leaders (RLs) during the development of positive leaders reveal a highly branched structure that is not usually recorded when using conventional photographic and video cameras. The existence of the RLs may help to explain observations of UHF-VHF radiation during the development of +CG flashes. | |
dc.language | eng | |
dc.publisher | Amer Geophysical Union | |
dc.relation | Geophysical Research Letters | |
dc.relation | 4.339 | |
dc.relation | 2,657 | |
dc.rights | Acesso restrito | |
dc.source | Web of Science | |
dc.title | Positive leader characteristics from high-speed video observations | |
dc.type | Artigo | |