@InProceedings{AntunesSarPinCamAlv:2014:DiViCh,
author = "Antunes, Larissa and Saraiva, Antonio Carlos Varela and Pinto Jr.,
Osmar and Campos, Leandro Zanella de Souza and Alves,
J{\'e}ferson",
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 lightining flashes
for a case study occurred in southeast Brazil during the summer of
2012/2013",
booktitle = "Proceedings...",
year = "2014",
organization = "International Conference on Atmospheric Electricity, 15. (ICAE).",
note = "Informa{\c{c}}{\~o}es Adicionais: The objective of the present
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 for this day were: a) flash duration geometric
mean of 193 ms; b) an average multiplicity of 2.8; and c) a
percentage of single stroke flashes, around 36.4% (20). Also, an
evaluation of the sample obtained on that day was performed using
lightning location system BrasilDAT. After the evaluation of the
statistical tests, we point out the following three hypotheses
which will be addressed in the work: a) synoptic condition of the
day: the weather phenomenon acting in the region during that day
may have favored the formation of clouds with smaller vertical
development, thus leading to temporally shorter and single-stroke
flashes; b) region of occurrence of lightning: the topography can
influence the formation of clouds in order to create the ne.",
keywords = "Atmospheric Electricity, Lightning Physics, High-speed video,
Thunderstorm days.",
abstract = "The objective of the present work is to analyze one thunderstorm
day that produced lightning with peculiar characteristi cs,
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 numb er 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 camera s, 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 durat ion 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 22 nd , 2013, which had a sample
size of 55 negative cloud - to - ground lightning. The visible
lightning characteristics for this day were: a) flash duration
geometric mean of 193 ms; b) an average multiplicity of 2.8; and
c) a percentage of single stroke flashes, around 36.4% (20). Also,
an evaluation of the sample obtained on that day was performed
using lightning location system BrasilDAT. After the evaluation of
the statistical tests, we point out the following three hypotheses
which will be addressed in the work: a) s ynoptic condition of the
day: the weather phenomenon acting in the region during that day
may have favored the formation of clouds with smaller vertical
development, thus leading to temporally shorter and single -
stroke flashes; b) region of occurrence of l ightning: the
topography can influence the formation of clouds in order to
create the necessary conditions for the occurrence of anomalous
features; and c) observation period: it is possible that the
flashes have been observed during the initial phase of t he
development of the thunder clouds, which would be directly related
to observed characteristics. Satellite and radar images will also
be used as complementarily tools for the analysis, which is
currently under development.",
conference-location = "Norman",
conference-year = "15-20 June 2014",
label = "lattes: 4161737266837399 4 AntunesSarPinCamAlv:2014:DiViCh",
language = "en",
targetfile = "Antunes_20antunes.pdf",
url = "http://www.nssl.noaa.gov/users/mansell/icae2014/preprints/Antunes_20.pdf",
urlaccessdate = "24 abr. 2024"
}