@MastersThesis{Lauria:2021:EsLíAs,
               author = "Lauria, Paola Beatriz",
                title = "Estudo de l{\'{\i}}deres ascendentes iniciados nos para-raios em 
                         resposta {\`a}s descargas descendentes negativas",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "2021",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "2021-05-17",
             keywords = "l{\'{\i}}der ascendente conectivo, c{\^a}mera r{\'a}pida, 
                         corrente el{\'e}trica, prote{\c{c}}{\~a}o, upward connecting 
                         leader, high speed camera, electric current, protection.",
             abstract = "As etapas de inicia{\c{c}}{\~a}o, desenvolvimento e 
                         propaga{\c{c}}{\~a}o do raio s{\~a}o assuntos amplamente 
                         discutidos no meio cient{\'{\i}}fico. O processo de conex{\~a}o 
                         de um raio com estruturas no solo {\'e} algo extremamente 
                         importante de se entender e n{\~a}o completamente conhecido. 
                         S{\~a}o poucos os estudos que se utilizam de c{\^a}meras, campo 
                         el{\'e}trico e corrente na observa{\c{c}}{\~a}o do processo de 
                         conex{\~a}o dos para-raios com os l{\'{\i}}deres de descargas 
                         descendentes negativas. A descarga de retorno (DR) {\'e} o 
                         resultado de uma conex{\~a}o bem-sucedida entre o l{\'{\i}}der 
                         descendente e o l{\'{\i}}der ascendente conectivo (LAC). Caso o 
                         l{\'{\i}}der descendente n{\~a}o se conecte, o l{\'{\i}}der 
                         ascendente colapsa e, a carga presente em seu canal retorna ao 
                         local de origem num intervalo de poucos microssegundos. A 
                         aus{\^e}ncia de informa{\c{c}}{\~o}es relacionadas a esse 
                         processo f{\'{\i}}sico deve-se, principalmente, {\`a} 
                         dificuldade de obten{\c{c}}{\~a}o de registros. Enquanto a 
                         propaga{\c{c}}{\~a}o do l{\'{\i}}der escalonado em 
                         dire{\c{c}}{\~a}o ao solo dura em m{\'e}dia 35 ms, um 
                         l{\'{\i}}der ascendente conectivo surge em menos de um 
                         milissegundo antes da DR. Este trabalho estudou dados de 3 eventos 
                         de L{\'{\i}}deres Ascendentes n{\~a}o Conectivos (LANCs) e 1 
                         evento de LAC. Os resultados encontrados abordam 
                         informa{\c{c}}{\~o}es de amplitude e intervalo entre pulsos de 
                         corrente el{\'e}trica, colapso da corrente, carga transferida, 
                         sinal de campo el{\'e}trico, extens{\~a}o e velocidade dos 
                         l{\'{\i}}deres ascendentes e densidade linear de cargas. O 
                         tratamento desses dados auxiliou no entendimento da 
                         intera{\c{c}}{\~a}o entre estruturas no solo e l{\'{\i}}deres 
                         descendentes, abrindo caminhos para uma melhor compreens{\~a}o no 
                         m{\'e}todo de prote{\c{c}}{\~a}o de estruturas e 
                         consequentemente no resguardo de poss{\'{\i}}veis 
                         v{\'{\i}}timas. ABSTRACT: The stages of initiation, development 
                         and propagation of lightning are subjects widely discussed in the 
                         scientific community. The connecting process between downward 
                         leaders to structures in the ground is extremely important to 
                         understand but not completely known. There are few studies using 
                         cameras, electric field and current in the observation of the 
                         connection process between lightning rods and downward negative 
                         leaders. The return stroke is the result of a successful 
                         connection between downward leader and upward connecting leader 
                         (UCL). If the stepped leader does not connect, the upward 
                         connecting leader collapses, and the charge present in its channel 
                         returns to the place of origin within a microsecond interval. The 
                         absence of information related to this physical process is mainly 
                         due to the difficulty of obtaining records. While the propagation 
                         of the stepped leader lasts an average of 35 ms, an upward 
                         connecting leader lasts less than 1 ms. This work studied data 
                         from 3 Unconnected Upward Leader (UUL) events and 1 UCL event. The 
                         results found address information of amplitude and interval 
                         between pulses of electric current, current collapse, transferred 
                         charge, electric field signal, extension and speed of upward 
                         leaders and linear charge density. The treatment of these data 
                         helped to understand the interaction between structures on the 
                         ground and descendant leaders, opening paths for a better 
                         understanding of the method of protecting structures and, 
                         consequently, the protection of possible victims.",
            committee = "Pimenta, Alexandre Alvares (presidente) and Saba, Marcelo 
                         Magalh{\~a}es Fares (orientador) and Schumann, Carina 
                         (orientadora) and Paula, Eurico de and Ferro, Marco Ant{\^o}nio 
                         da Silva",
         englishtitle = "Study of upward leaders initiated by lightning rods response to 
                         downward negative leaders",
             language = "pt",
                pages = "132",
                  ibi = "8JMKD3MGP3W34R/44NRAE5",
                  url = "http://urlib.net/ibi/8JMKD3MGP3W34R/44NRAE5",
           targetfile = "publicacao.pdf",
        urlaccessdate = "10 maio 2024"
}