@InProceedings{CamposSabaSchuSchu:2011:ChMCo,
author = "Campos, Leandro Zanella de Souza and Saba, Marcelo Magalh{\~a}es
Fares and Schumann, Carina and Schulz, Wolfgang",
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)}",
title = "Characterization of M components in positive lightning from
high-speed video and electric field data",
booktitle = "Proceedings...",
year = "2011",
organization = "International Symposium on Winter Lightning, 3.",
note = "Informa{\c{c}}{\~o}es Adicionais: Recent high-speed video
experiments have indicated that positive cloud-to-ground lightning
(+CG) might present M components during their continuing current
period. As only optical data were available, their results
consisted mainly on occurrence- and time-related parameters and
their statistical distribution. In the present work we address
this issue by extending those investigations through the addition
of simultaneous slow and fast electric field data (obtained
through the use of capacitive antennas) to the high-speed camera
recordings (obtained by two different cameras, Red Lake Motion
Scope 8000S and Photron Fastcam 512 PCI, operating at frame rates
ranging from 1000 or 8000 frames per second). Through the use of
an algorithm previously developed by the authors we were able to
plot luminosity-versus-time curves of each continuing current
recorded by the cameras. Once an individual M component is
identified in this luminosity data, it is possible to find the
electric field change it has produced and that could be measured
by the antennas. By using a simple electrostatic model it is
possible to estimate the peak current and total charge transfer to
ground of each M component observed from the slow electric field
data. These intensity-related parameters can be also be correlated
to occurrence- and time-related parameters such as duration,
elapsed time since the return stroke and time interval between
successive M components, making it possible to see at which
periods of a continuing current M components can be more or less
intense. This type of data is very relevant for both engineering
applications (such as EMC studies) and scientific research
(especially sprite initiation and the bidirectional leader model
for lightning)..",
keywords = "Positive lightning, TLE, Sprites, Lightning Physics, M
Components.",
abstract = "Recent high-speed video experiments have indicated that positive
cloud-to-ground lightning (+CG) might present M components during
their continuing current period [1]. As only optical data were
available, their results consisted mainly on occurrence- and
time-related parameters and their statistical distribution. In the
present work we address this issue by extending those
investigations through the addition of simultaneous slow and fast
electric field data (obtained through the use of capacitive
antennas) to the high-speed camera recordings (obtained by two
different cameras, Red Lake Motion Scope 8000S and Photron Fastcam
512 PCI, operating at frame rates ranging from 1000 or 8000 frames
per second). Through the use of an algorithm previously developed
by the authors [1-2] we were able to plot luminosity-versus-time
curves of each continuing current recorded by the cameras. Once an
individual M component is identified in this luminosity data, it
is possible to find the electric field change it has produced and
that could be measured by the antennas. By using a simple
electrostatic model it is possible to estimate the peak current
and total charge transfer to ground of each M component observed
from the slow electric field data. These intensity-related
parameters can be also be correlated to occurrence- and
time-related parameters such as duration, elapsed time since the
return stroke and time interval between successive M components,
making it possible to see at which periods of a continuing current
M components can be more or less intense. This type of data is
very relevant for both engineering applications (such as EMC
studies [3]) and scientific research (especially sprite initiation
[4] and the bidirectional leader model for lightning [5])..",
conference-location = "Sapporo, Japan",
conference-year = "15-16 june",
label = "lattes: 4161737266837399 1 CamposSabaSchuSchu:2011:ChOfM",
language = "en",
targetfile = "3_Campos_ua_ISWL_2011[1].pdf",
volume = "1",
urlaccessdate = "21 maio 2024"
}