Marco Jusevicius - Academia.edu (original) (raw)

Papers by Marco Jusevicius

Research paper thumbnail of Ciclogenese a sotavento dos Andes: Estudo observacional e simulacao numerica de um evento

ABSTRACT Number of Pages: 131

Research paper thumbnail of Thunderstorms observations at Sao Paulo urban area: 2007-2010 

A total of 181 thunderstorms were observed in the urban area of Sao Bernardo do Campo, Sao Paulo,... more A total of 181 thunderstorms were observed in the urban area of Sao Bernardo do Campo, Sao Paulo, during the warm season (October to May) from 2007 to 2010. Three campaigns of continuous monitoring identified the thunderstorms by the usage of local E-field and video cameras. Most thunderstorms were associated with local convection, presenting extensive horizontal charge structure. Thunderstorm days (Td) were obtained by local E-field measurements, considering a threshold of 5kV/m in a period of 30 minutes to count as a Td. Monthly distribution of Td obtained by E-field measurements were compared to METAR (METeorological Aerodrome Report) data available for Congonhas Airport, located 10km from Sao Bernardo do Campo. The data presented a correlation coefficient of 0.91 for this period, suggesting E-field methodology as good information of thunderday. A considerable increase on annual number of thunderday per year was observed on records from 2007-2008 to 2009-2010 and can be associate...

Research paper thumbnail of Lightning and Radar Observations of Mesoscale Convective Systems in the South of Brazil During the Warm Season *

This paper presents results of the analysis of weather radar and lightning characteristics of mes... more This paper presents results of the analysis of weather radar and lightning characteristics of mesoscale convective systems in the south of Brazil. Precipitation regimes were identified using an objective clustering algorithm in radar volume data and then compared with lightning flashes. There are 4 distinct regimes, or clusters, indicating that mesoscale convective systems occur throughout the year with distinct diurnal cycle.

Research paper thumbnail of PROGRESS IN PROTECTING POWER SYSTEMS AGAINST IMPULSE CHARGE AND CONTINUING CURRENT EFFECTS OF LIGHTNING FLASHES

This document summarizes the international developments of appropriate test methods, standards an... more This document summarizes the international developments of appropriate test methods, standards and risk models for the damage of lightning charge to the metallic components and metal-oxide surge arresters of high voltage electric power systems and focuses some attention on how these parameters may be estimated in southeast South America.

Research paper thumbnail of The Monitoring Of Thunderstorm In Sao Paulo's Urban Areas, Brazil

A monitoring of thunderstorm in urban areas occurred in the vicinity of Sao Bernardo do Campo, Sa... more A monitoring of thunderstorm in urban areas occurred in the vicinity of Sao Bernardo do Campo, Sao Paulo from November 2004 to March 2005. Eight thunderstorms were monitored by local electric field, video camera, Brazilian Lightning Location Network (RINDAT) and weather radar. The most of these thunderstorms were associated with the local convection and cold front. Some of these events presented floods in the vicinity of Sao Bernardo and in the Metropolitan Area of Sao Paulo (MASP) being associated with local sea breeze circulation and the heat island effect. The convectives cells exceeding 100km x 100 km of area, actives between 2 and 3 hours. The local electric field identified the electrification stage of thunderstorms, high transients of lightning and total lightning rate of above 10 flashes per minute. About 29.5 thousands of cloud-to-ground lightning flashes were analyzed . From the total set of CG flashes analyzed, about 94 percent were negative strokes and presented average peak current of above 25kA, common for this region. Some lightning images were obtained by video camera and compared with transients of lightning and lightning detection network data. The most of these transients of lightning presented continuing current duration between 100ms and 200ms. A CG lightning occurred on 25th February was visually observed 3.5km from FEI campus, Sao Bernardo do Campo. This lightning presented negative polarity and estimed peak current of above 30kA. A spider was visually observed over FEI Campus at 17th March. No transients of lightning and recording by lightning location network were found.

Research paper thumbnail of O SISTEMA DE AVALIAÇÃO DA PREVISÃO DE TEMPO NA WEATHER SERVICES INTERNATIONAL-WSI

1. INTRODUÇÃO A última década foi marcada por grandes avanços científicos e tecnológicos nos cent... more 1. INTRODUÇÃO A última década foi marcada por grandes avanços científicos e tecnológicos nos centros regionais e nacionais de meteorologia do Brasil. Apesar da carência dos dados meteorológicos, grandes esforços foram feitos pela comunidade científica, buscando o ...

Research paper thumbnail of Ciclogenese a sotavento dos Andes: Estudo observacional e simulacao numerica de um evento

ABSTRACT Number of Pages: 131

Research paper thumbnail of Thunderstorms observations at Sao Paulo urban area: 2007-2010 

A total of 181 thunderstorms were observed in the urban area of Sao Bernardo do Campo, Sao Paulo,... more A total of 181 thunderstorms were observed in the urban area of Sao Bernardo do Campo, Sao Paulo, during the warm season (October to May) from 2007 to 2010. Three campaigns of continuous monitoring identified the thunderstorms by the usage of local E-field and video cameras. Most thunderstorms were associated with local convection, presenting extensive horizontal charge structure. Thunderstorm days (Td) were obtained by local E-field measurements, considering a threshold of 5kV/m in a period of 30 minutes to count as a Td. Monthly distribution of Td obtained by E-field measurements were compared to METAR (METeorological Aerodrome Report) data available for Congonhas Airport, located 10km from Sao Bernardo do Campo. The data presented a correlation coefficient of 0.91 for this period, suggesting E-field methodology as good information of thunderday. A considerable increase on annual number of thunderday per year was observed on records from 2007-2008 to 2009-2010 and can be associate...

Research paper thumbnail of Lightning and Radar Observations of Mesoscale Convective Systems in the South of Brazil During the Warm Season *

This paper presents results of the analysis of weather radar and lightning characteristics of mes... more This paper presents results of the analysis of weather radar and lightning characteristics of mesoscale convective systems in the south of Brazil. Precipitation regimes were identified using an objective clustering algorithm in radar volume data and then compared with lightning flashes. There are 4 distinct regimes, or clusters, indicating that mesoscale convective systems occur throughout the year with distinct diurnal cycle.

Research paper thumbnail of PROGRESS IN PROTECTING POWER SYSTEMS AGAINST IMPULSE CHARGE AND CONTINUING CURRENT EFFECTS OF LIGHTNING FLASHES

This document summarizes the international developments of appropriate test methods, standards an... more This document summarizes the international developments of appropriate test methods, standards and risk models for the damage of lightning charge to the metallic components and metal-oxide surge arresters of high voltage electric power systems and focuses some attention on how these parameters may be estimated in southeast South America.

Research paper thumbnail of The Monitoring Of Thunderstorm In Sao Paulo's Urban Areas, Brazil

A monitoring of thunderstorm in urban areas occurred in the vicinity of Sao Bernardo do Campo, Sa... more A monitoring of thunderstorm in urban areas occurred in the vicinity of Sao Bernardo do Campo, Sao Paulo from November 2004 to March 2005. Eight thunderstorms were monitored by local electric field, video camera, Brazilian Lightning Location Network (RINDAT) and weather radar. The most of these thunderstorms were associated with the local convection and cold front. Some of these events presented floods in the vicinity of Sao Bernardo and in the Metropolitan Area of Sao Paulo (MASP) being associated with local sea breeze circulation and the heat island effect. The convectives cells exceeding 100km x 100 km of area, actives between 2 and 3 hours. The local electric field identified the electrification stage of thunderstorms, high transients of lightning and total lightning rate of above 10 flashes per minute. About 29.5 thousands of cloud-to-ground lightning flashes were analyzed . From the total set of CG flashes analyzed, about 94 percent were negative strokes and presented average peak current of above 25kA, common for this region. Some lightning images were obtained by video camera and compared with transients of lightning and lightning detection network data. The most of these transients of lightning presented continuing current duration between 100ms and 200ms. A CG lightning occurred on 25th February was visually observed 3.5km from FEI campus, Sao Bernardo do Campo. This lightning presented negative polarity and estimed peak current of above 30kA. A spider was visually observed over FEI Campus at 17th March. No transients of lightning and recording by lightning location network were found.

Research paper thumbnail of O SISTEMA DE AVALIAÇÃO DA PREVISÃO DE TEMPO NA WEATHER SERVICES INTERNATIONAL-WSI

1. INTRODUÇÃO A última década foi marcada por grandes avanços científicos e tecnológicos nos cent... more 1. INTRODUÇÃO A última década foi marcada por grandes avanços científicos e tecnológicos nos centros regionais e nacionais de meteorologia do Brasil. Apesar da carência dos dados meteorológicos, grandes esforços foram feitos pela comunidade científica, buscando o ...