@InProceedings{AntunesSarPinCamAlv:2015:DiViCh,
author = "Antunes, Larissa and Saraiva, A. and Pinto Junior, Osmar and
Campos, L. and Alves, J.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "Differences between visible characteristics of lightning flashes
for a case study occurred in southeast Brazil during the summer of
2012/2013",
year = "2015",
organization = "IUGG General Assembly, 26.",
abstract = "The objective of the work is to analyze one thunderstorm day that
produced lightning with peculiar characteristics, different from
those commonly found in other works on the literature. The data
was obtained by the RAMMER network, composed by four high-speed
cameras, during the summer of 2012/2013 in the city of S{\~a}o
Jos{\'e} dos Campos, Brazil. The relatively large number of
high-speed cameras has enabled us to record a statistically
significant amount of negative cloud-to-ground lightning flashes
per thunderstorm day. We chose as control-cases the five days that
had the highest amount of lightning recorded by the cameras,
making a total of 361 flashes. The analysis was performed in two
ways, the first one considering the control-cases and the second
one considering only the case study. After analyzing all lightning
data we found that the geometric mean of the flash duration was
270 ms, the average multiplicity was 4.3 and the percentage of
single strokes was 20.8% (75 events). These values are similar to
those found in previous single-station studies for the same
region. The case study of this work is February 22nd, 2013, which
had a sample size of 55 negative cloud-to-ground lightning. The
visible lightning characteristics found for this day were:
geometric mean of flash duration of 193 ms; average of
multiplicity of 2.8; and percentage of single stroke flashes,
around 36.4% (20). After evaluation of the statistical tests of
the sample obtained on that day, the lightning location system
BrasilDAT, satellite and radar images were used as complementarily
tools for the analysis. We point the hypothesis that the formation
of clouds with smaller vertical development, has led to lightning
temporally shorter and single-stroke flashes.",
conference-location = "Prague, Czech Republic",
conference-year = "22 June - 02 July",
urlaccessdate = "20 set. 2024"
}