@InProceedings{CamposSabBalPinFer:2011:InTiOc,
author = "Campos, Leandro Zanella de Souza and Saba, Marcelo Magalh{\~a}es
Fares and Ballarotti, Maur{\'{\i}}cio Grade and Pinto Junior,
Osmar and Ferraz, Evandro de Carvalho",
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 = "Intensity-, time- and occurrence-related parameters of natural
lightning M components from simultaneous high-speed video
recordings and electric-field measurements",
booktitle = "Proceedings...",
year = "2011",
organization = "ICAE - International Conference on Atmospheric Electricity, 14.",
note = "Informa{\c{c}}{\~o}es Adicionais: Until recently, most of the
knowledge available on the characteristics of lightning M
components was obtained either from direct channel-base current
measurements in triggered lightning (e.g., Thottappillil et al.,
1995) or stand-alone electric-field measurements in natural
lightning (e.g., Thottappillil et al., 1990). Campos et al. (2007,
2009) used stand-alone high-speed video data recorded at 1000
frames per second in order to obtain time- and occurrence-related
parameters of natural lightning M components of both polarities.
This type of data is very relevant for both engineering
applications (such as EMC studies) and scientific research
(especially sprite initiation). In the present work we combine
high-speed video 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) with
slow and fast electric field measurements (obtained through the
use of capacitive antennas) to improve the physical
characterization of this phenomenon. Through the use of an
algorithm 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..",
keywords = "M Components, Lightning Physics, Recoil leaders, Sprites, TLE.",
abstract = "ABSTRACT: Until recently, most of the knowledge available on the
characteristics of lightning M components was obtained either from
direct channel-base current measurements in triggered lightning
(e.g., Thottappillil et al., 1995) or stand-alone electric-field
measurements in natural lightning (e.g., Thottappillil et al.,
1990). Campos et al. (2007, 2009) used stand-alone high-speed
video data recorded at 1000 frames per second in order to obtain
time- and occurrence-related parameters of natural lightning M
components of both polarities. This type of data is very relevant
for both engineering applications (such as EMC studies) and
scientific research (especially sprite initiation). In the present
work we combine high-speed video 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) with slow and fast electric field measurements
(obtained through the use of capacitive antennas) to improve the
physical characterization of this phenomenon. Through the use of
an algorithm 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.",
conference-location = "Rio de Janeiro",
conference-year = "08-12 August",
label = "lattes: 4161737266837399 1 CamposSabBalPinFer:2011:InTiAn",
language = "en",
targetfile = "L Campos - Intensity-, time- and occurrence-related parameters of
natural lightning M components from simultaneous high-speed video
recordings and electric-fi.pdf",
volume = "1",
urlaccessdate = "21 maio 2024"
}