LONG CONTINUING LUMINOSITY OF CLOUD-TO-GROUND FLASHES OBSERVATIONS AT URBAN AREA, BRAZIL
Long continuous luminosity of cloud-to-ground flashes (LCL) was observed from November 2006 to March 2007 at Metropolitan Area of S(a)o Paulo (MASP). The flashes presented continuing luminosity lasting more than 60 ms suggesting occurrence of long continuing current flashes. Flashes presenting longcontinuing current transfer more charge to earth than other ones and seem be associated to lateral extensive structure of thunderstorms. Four video camera monitoring continuously the same region, identifying luminosity of flashes in time interval of 15 ms. A extensive area of maximum rainfall rate was observed moving from Southwest to Southeast, flood event at MASP on 19 December, 2006. From flashes recorded by video camera about 70％ presented long continuous luminosity flashes lasting from 60 ms to 340 ms. Hybrid flashes presented more than one long continuous luminosity identifying until 4 LCL per flash. Activity of cloud-to-ground lightning flashes was studied to LCL period within 25-km radius at MASP. From the total of lightning flashes identified by Lightning Detection System (LDS), about 107 flashes was recorded and 98％ presented negative polarity. This set of flashes, about 70％ of negative flashes and 100％ of positive flashes presented single stroke. About 84％ of multiple negative flashes presented from 2 to 3 strokes that is coincident with observed to negative cloud-to-ground flashes in this region.
Rosangela Barreto Biasi Gin Augusto José Pereira Filho Cesar Beneti
Department of Physics, University of FEI, Sāo Bernardo do Campo, Sāo Paulo 09.850-901, Brazil Instituto Astrǒnomico e Geofísico, University of Sāo Paulo, Sāo Paulo, 05.580-090, Brazil Technological Institute SIMEPAR, Curitiba, Paraná, 81.531-980, Brazil
国际会议
第13届国际大气电学会议(The 13th International Conference on Atmospheric Electricity)
北京
英文
2007-08-13（万方平台首次上网日期，不代表论文的发表时间）