@PhDThesis{Schumann:2016:EsRaAs,
author = "Schumann, Carina",
title = "Estudo dos raios ascendentes a partir de observa{\c{c}}{\~o}es
de c{\^a}meras de alta resolu{\c{c}}{\~a}o temporal e de
medidas de campo el{\'e}trico",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2016",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2016-06-03",
keywords = "raios ascendentes, raios em torres, raios em estruturas altas,
upward flashes, flashes on towers, lightning flashes in tall
structures.",
abstract = "Nos {\'u}ltimos anos o interesse pelos raios ascendentes tem
crescido muito com o crescente uso de estruturas altas associadas
principalmente com torres de comunica{\c{c}}{\~a}o,
edif{\'{\i}}cios altos e turbinas e{\'o}licas. Este trabalho
descreve o estudo das caracter{\'{\i}}sticas e
inicia{\c{c}}{\~a}o dos raios ascendentes, feito pela primeira
vez, no Brasil e nos Estados Unidos. Durante o estudo foram
realizadas 8 campanhas de aquisi{\c{c}}{\~a}o de dados. Para a
caracteriza{\c{c}}{\~a}o dos raios ascendentes foram utilizados
100 casos registrados por c{\^a}meras r{\'a}pidas. As
caracter{\'{\i}}sticas observadas foram: dura{\c{c}}{\~a}o,
ramifica{\c{c}}{\~o}es, presen{\c{c}}a de recoil leaders,
intervalo entre descargas, pulsos de corrente cont{\'{\i}}nua
inicial, entre outras. Tamb{\'e}m foram utilizados sensores de
campo el{\'e}trico ambiente para determinar fase da tempestade em
que os raios ascendentes se iniciaram e a sua influ{\^e}ncia no
campo el{\'e}trico. Os dados de mapeamento tridimensional da
descarga foram utilizados para verificar a propaga{\c{c}}{\~a}o
das descargas matrizes que s{\~a}o respons{\'a}veis pela
inicia{\c{c}}{\~a}o dos raios ascendentes. Foram elaboradas
hip{\'o}teses para a inicia{\c{c}}{\~a}o do raio ascendente e
obtiveram-se confirma{\c{c}}{\~o}es parciais das mesmas.
ABSTRACT: Recently, the interest on upward flashes has increased,
due to the recent increasing number of tall buildings, wind
turbines, telecommunication towers, and man-made tall structures.
The present study of upward flashes in Brazil and in United States
allowed, for the first time, the characterization of upward
flashes and its initiation. The data analyzed in this study was
obtained during 8 campaigns. The characterization of upward
flashes was based on a 100 cases registered by high-speed cameras.
The characteristics observed were: duration, branching, presence
of recoil leaders, interval between return strokes, pulses
superimposed on the initial continuous current, etc. Also,
electric field mill sensors were used to determine the
thunderstorm phase that upward flashes occurred and their
influence on the environment electric field. Data of the lightning
mapping array was used to analyze the propagation of the
triggering flashes i.e. responsible for triggering upward flashes.
A hypothesis was elaborated for the initiation of upward flashes
and a partial confirmation of them was obtained.",
committee = "Batista, Inez Staciarini (presidente) and Saba, Marcelo
Magalh{\~a}es Fares (orientador) and Ferro, Marco Antonio da
Silva (orientador) and Naccarato, Kleber Pinheiro and Plantini,
Alexandre and Lacerda, Moacir",
copyholder = "SID/SCD",
englishtitle = "Upward lightning flash characterization from high-speed camera
videos and electric field measurements",
language = "pt",
pages = "178",
ibi = "8JMKD3MGP3W34P/3LKP8ML",
url = "http://urlib.net/ibi/8JMKD3MGP3W34P/3LKP8ML",
targetfile = "publicacao.pdf",
urlaccessdate = "15 jun. 2024"
}