Cloud To Ground Discharges
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Relationship between physical properties convective clouds and cloud-ground lightining / Relações das propriedades físicas das nuvens convectivas com as descargas elétricas
The knowledge of physical and microphysical properties associated to cloud-ground lightning occurrence is very important for determination of potential forecast parameters of electrical discharges activity. The identification of these parameters could give valuable contribution for different segments of society, such as the sectors of electric energy distrib
Publicado em: 2009
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2. Relationship between physical properties convective clouds and cloud-ground lightining / Relações das propriedades físicas das nuvens convectivas com as descargas elétricas
O entendimento das propriedades físicas e microfísicas associadas à formação e ocorrência da atividade elétrica em nuvens convectivas utilizando dados observacionais, é de grande importância para a determinação de parâmetros previsores da ocorrência desses fenômenos atmosféricos. Visto que diversos segmentos da sociedade como, os setores de re
Publicado em: 2009
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3. Evaluation of the Characteristics of Lightning Return Stroke Electromagnetic Fields Generated by Cloud-to-Ground Lightning. / Avaliação do Comportamento dos Campos Eletromagnéticos Gerados por Descargas Atmosféricas Nuvem-Terra
The occurrence of lightning discharges causes a significant amount of unscheduled supply interruptions in overhead lines of electricity systems, contributing to decrease quality indicators of these systems, even in the case of regions with moderated ground flash density. Focusing on the distribution systems, great part of the problems are related to the indu
Publicado em: 2007
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4. Análise das características dos relâmpagos na região sudeste do Brasil / Lightning characteristics in southeastern Brazil
Estudos climatológicos de raios no Brasil não são recentes. Os primeiros trabalhos publicados datam da metade da década de 90. Entretanto, nessa época, não se contava com uma rede de detecção de raios abrangente no país, fazendo com que as análises ficassem restritas a regiões bem específicas. No início desta década, novos trabalhos foram publi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2005
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5. Análise das características dos relâmpagos na região sudeste do Brasil / Lightning characteristics in southeastern Brazil
The first climatological studies of cloud-to-ground (CG) lightning flashes characteristics in Brazil were published at the middle of 90. However, at that time, the lightning detection network used to be composed by only a few sensors, which restricted the analyses to some specific regions. In the beginning of this decade, new studies were published using lig
Publicado em: 2005
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6. Estudo das características de relâmpagos nuvem-solo negativos através da análise comparativa de observações por múltiplas técnicas. / Study of negative cloud-to-ground lightning features from comparative analysis of observations by multiple techniques.
For the first time in Brazil, an electric field antenna for lightning radiation, with 1.25 µs resolution was developed. From thunderstorms over Sao José dos Campos, between February and March of 2003, information of lightning synchronized to GPS time, were simultaneously obtained by this antenna, by a 1ms resolution high-speed camera and by the Brazilian L
Publicado em: 2004
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7. Estudo das características de relâmpagos nuvem-solo negativos através da análise comparativa de observações por múltiplas técnicas. / Study of negative cloud-to-ground lightning features from comparative analysis of observations by multiple techniques.
For the first time in Brazil, an electric field antenna for lightning radiation, with 1.25 µs resolution was developed. From thunderstorms over Sao José dos Campos, between February and March of 2003, information of lightning synchronized to GPS time, were simultaneously obtained by this antenna, by a 1ms resolution high-speed camera and by the Brazilian L
Publicado em: 2004
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8. Estudo comparativo da atividade e características dos relâmpagos nas regiões de Rôndonia e sudeste, no período de outubro de 1999 a março de 2000. / A comparative study of the lightning activity and characteristics in Rondônia and southeastern Brazil during the october 1999 - march 2000 period.
Neste estudo foram analisadas a atividade e as características dos relâmpagos nas regiões de Rondônia e sudeste do Brasil no período de outubro/1999 a março/2000. Os dados de relâmpagos nuvem-solo em Rondônia foram obtidos pelo sistema Brazil Lightning Detection Network (BLDN), que registrou durante o período um total de 1.753.240 relâmpagos. Na
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 200205
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9. Estudo dos relâmpagos na região sudeste do Brasil em função das características geográficas / A study of geographic influences on the lightning characteristics in the southeastern area of Brazil
This work presents a study of geographic influences on the lightning characteristics in Minas Gerais, in the Southeastern Brazil, within an area delimited by 18° to 21° S and 43° to 47° W. The period of study was eight years, from October 1988 to November 1996. The lightning and meteorological data were obtained, respectively, by a Lightning Position and
Publicado em: 2002
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10. Estudo das características dos relâmpagos nuvem-solo durante dias de grande atividade no estado de Minas Gerais nos anos de 1992 a 1994. / Study of the characteistics of the lightnings cloud-to-ground during days of high activity in the state of Minas Gerais in the years from 1992 to 1994.
The characteristics of cloud-to-ground flashes in the southeastern region of Brazil were analyzes for the days of high activity from 1992 to 1994. the data were obtained by a Lightning Positioning and Tracking System (LPATS). The following characteristics of about 450,000 strokes were studied: polarity, multiplicity, peak-current and diurnal variation. The e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 199803
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11. Study of the characteistics of the lightnings cloud-to-ground during days of high activity in the state of Minas Gerais in the years from 1992 to 1994. / Estudo das características dos relâmpagos nuvem-solo durante dias de grande atividade no estado de Minas Gerais nos anos de 1992 a 1994.
As características dos relâmpagos nuvem-solo para a região sudeste do Brasil foram analisadas para os dias de grande atividade no período de 1992 a 1994. Os dados foram obitidos através de um sistema de localização de tempestade (LPATS), com cerca de 450.000 descargas de retorno, onde as características estudadas foram a polaridade, a multiplicidade,
Publicado em: 1998
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12. The cloud–ionosphere discharge: A newly observed thunderstorm phenomenon
This paper deals with a luminous electric discharge that forms in the mesospheric region between thundercloud tops and the ionosphere at 90-km altitude. These cloud–ionosphere discharges (CIs), following visual reports dating back to the 19th century, were finally imaged by a low-light TV camera as part of the “SKYFLASH” program at the University of Mi
The National Academy of Sciences of the USA.