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Titolo:
Does a lightning channel show a fractal?
Autore:
Kawasaki, Z; Matsuura, K;
Indirizzi:
Osaka Univ, Grad Sch Engn, Dept Elect Engn, Suita, Osaka 5650871, Japan Osaka Univ Suita Osaka Japan 5650871 ct Engn, Suita, Osaka 5650871, Japan
Titolo Testata:
APPLIED ENERGY
fascicolo: 1-2, volume: 67, anno: 2000,
pagine: 147 - 158
SICI:
0306-2619(200009/10)67:1-2<147:DALCSA>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
BREAKDOWN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
5
Recensione:
Indirizzi per estratti:
Indirizzo: Kawasaki, Z Osaka Univ, Grad Sch Engn, Dept Elect Engn, Yamada Oka 2-1, Suita, Osaka 5650871, Japan Osaka Univ Yamada Oka 2-1 Suita Osaka Japan 5650871 871, Japan
Citazione:
Z. Kawasaki e K. Matsuura, "Does a lightning channel show a fractal?", APPL ENERG, 67(1-2), 2000, pp. 147-158

Abstract

Forecasting the striking point of a lightning flash is important for the reduction of lightning hazards. Field campaigns have been conducted, and thefeatures of leader progression have been investigated for this final goal. Both streak and still camera observations are used, because we can obtain useful information on the leader progression manner and its velocity. A radio interferometer is another useful instrument, by which, we can capture a lightning channel image from its initiation inside the thundercloud to the attachment process to the ground. Though many laborious investigations havebeen performed and various results have been presented, the exact forecasting of a striking point still remains difficult. To overcome this, numerical simulations of a stepped leader near the ground surface have been carriedout using the leader progression model, which has been improved by using the fractal mathematical concept. In other words, the proposed scheme in this paper is a probabilistic procedure. The finite-difference approach is applied to the two-dimensional Poisson's equation to calculate the electric field produced by the charge distribution in a thundercloud. The stepped leaders, which are initiated at the lower part of the cloud and usually proceedtowards the ground, are simulated to study the theoretical stepped leader progression. The zig-tags and branches of a lightning channel can also be simulated. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 06:39:24