@Article{SabaScWaHeScOr:2013:BiClLi,
author = "Saba, Marcelo Magalh{\~a}es Fares and Schumann, C. and Warner, T.
A. and Helsdon Jr., J. H. and Schulz, W. and Orville, R. E.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and National
Institute for Space Research, INPE, Av dos Astronautas, 1758, S.
Jos{\'e} dos Campos, SP, 12227-010, Brazil and South Dakota
School of Mines and Technology, Rapid City SD, United States and
South Dakota School of Mines and Technology, Rapid City SD, United
States and Austrian Lighting Detection and Information System,
Vienna, Austria and Texas AandM University, College Station TX,
United States",
title = "Bipolar cloud-to-ground lightning flash observations",
journal = "Journal of Geophysical Research",
year = "2013",
volume = "118",
number = "19",
pages = "11098--11106",
keywords = "bipolar flash, positive lightning, negative lightning, high-speed
video, electric field.",
abstract = "Bipolar lightning is usually defined as a lightning flash where
the current waveform exhibits a polarity reversal. There are very
few reported cases of cloud-to-ground (CG) bipolar flashes using
only one channel in the literature. Reports on this type of
bipolar flashes are not common due to the fact that in order to
confirm that currents of both polarities follow the same channel
to the ground, one necessarily needs video records. This study
presents five clear observations of single-channel bipolar CG
flashes. High-speed video and electric field measurement
observations are used and analyzed. Based on the video images
obtained and based on previous observations of positive CG flashes
with high-speed cameras, we suggest that positive leader branches
which do not participate in the initial return stroke of a
positive cloud-to-ground flash later generate recoil leaders whose
negative ends, upon reaching the branch point, traverse the return
stroke channel path to the ground resulting in a subsequent return
stroke of opposite polarity. Key Points Existence of
single-channel bipolar flashes Common characteristics of bipolar
flashes How can positive and negative discharges use the same path
to ground? ©2013. American Geophysical Union. All Rights
Reserved.",
doi = "10.1002/jgrd.50804",
url = "http://dx.doi.org/10.1002/jgrd.50804",
issn = "0148-0227 and 2156-2202",
label = "scopus 2013-11",
language = "en",
targetfile = "Istec 1883.pdf",
urlaccessdate = "05 jun. 2024"
}