@Article{WilliamsMattMach:2016:StMuHo,
author = "Williams, Earle R. and Mattos, Enrique Vieira and Machado, Luiz
Augusto Toledo",
affiliation = "{Massachusetts Institute of Technology} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "Stroke multiplicity and horizontal scale of negative charge
regions in thunderclouds",
journal = "Geophysical Research Letters",
year = "2016",
volume = "43",
number = "10",
pages = "5460--5466",
month = "May",
abstract = "An X-band polarimetric radar and multiple lightning detection
systems are used to document the initial cloud-to-ground lightning
flash in a large number (46 cases) of incipient thunderstorms, as
part of the CHUVA-Vale field campaign during the 2011/2012
spring-summer in southeast Brazil. The results show an
exceptionally low stroke multiplicity (87% of flashes with single
stroke) in the initial ground flashes, a finding consistent with
the limited space available for the positive leader extension into
new regions of negative space charge in compact cells. The results
here are contrasted with the behavior of ground flashes in
mesoscale thunderstorms in previous studies. Additionally, we
found evidence for a minimum scale (radar echo >20\ dBZ)
for lightning initiation (>3\ km in radius) and that the
peak currents of initial cloud-to-ground flashes in these compact
thunderstorms are only half as large as return stroke peak
currents in general.",
doi = "10.1002/2016GL068924",
url = "http://dx.doi.org/10.1002/2016GL068924",
issn = "0094-8276",
language = "en",
targetfile = "williams_stroke.pdf",
urlaccessdate = "27 abr. 2024"
}