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Ann. Geophys., 21, 1209-1213, 2003
www.ann-geophys.net/21/1209/2003/
© European Geosciences Union 2003
About the direction of motion, polarity and multiplicity of lightning flashes hitting towers: a comparative analysis of data gathered in Brazil and Switzerland
O. Pinto Jr.1, D. G. Guedes1, M. M. F. Saba1, I. R. C. A. Pinto1, and M. Lacerda2
1Instituto Nacional de Pesquisas Espaciais-INPE-São José dos campos, São Paulo, Brazil
2Universidade Federal do Mato Grosso, Cuibá, Mato Grosso, MT, Brazil
Abstract. After 17 years of
research at Morro do Cachimbo station (MC) in Brazil, 51 flashes with strokes
higher than 2 kA were registered. The data are compared with similar data
obtained from the Mount San Salvatore station (SS), Switzerland, in terms of
the incidence of downward or upward flashes, polarity, and flash multiplicity.
The comparison indicates that at MC the percentage of upward flashes and the
multiplicity of negative downward flashes are higher than at SS, while the
percentage of downward positive flashes is lower.
Key words. Meteorology and atmospheric dynamics
(atmospheric electricity; lightning; instruments and techniques)
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