%0 Journal Article
%3 1-s2.0-S1364682612002295-main.pdf
%@mirrorrepository iconet.com.br/banon/2006/11.26.21.31
%4 sid.inpe.br/mtc-m19/2013/06.12.01.41.02
%8 Jan.
%9 journal article
%@issn 1364-6826
%A Schumann, Carina,
%A Saba, Marcelo Magalhães Fares,
%A Silva, Raphael Bueno Guedes da,
%A Schulz, Wolfgang,
%@secondarytype PRE PI
%B Journal of Atmospheric and Solar-Terrestrial Physics
%D 2013
%F isi
%K positive lightning, preliminary breakdown, return stroke, electric field.
%@archivingpolicy denypublisher denyfinaldraft24
%N 6
%P 37-42
%@secondarymark A1 B1 B1 B1 B1 B2 C
%T Electric fields changes produced by positives cloud-to-ground lightning flashes
%V 92
%X Positive flashes correspond to approximately only 10\\% of the total number of flashes produced by a thunderstorm. However, strokes with high peak currents and long continuing currents are usually present in positive flashes. Therefore, positive flashes are responsible for more intense damage than the negative ones. Positive flashes often are preceded by significant and long duration intracloud (IC) discharge activity. We observe in detail the electric field variations produced by 80 cloud-to-ground lightning flashes in 9 different storms in S. Paulo, Brazil during the summers of 2009-2011. Intracloud discharges preceding the positive cloud-to-ground flashes and some characteristics of the electric field changes produced by the return stroke that occurred at ranges of 3-80 km from the site of the electric field measurements were analyzed. All flashes presented breakdown pulses prior to the return stroke. The mean time interval between the preliminary breakdown pulse (PBP) and return stroke was 157 ms. The pulse train duration have a mean value of 3.1 ms. Only 6 out of 80 cases analyzed did not present pulse trains but only one single bipolar breakdown pulse before the return stroke. In 95\\% of cases the initial breakdown pulse presented the same initial polarity of the succeeding return stroke. Time interval between pulses in a pulse train had a mean value of 280 mu s. The mean values of pulse width is 25.2 mu s. The mean values of zero-to-peak risetimes and of the 10-90\\% risetimes for 72 return strokes electric field waveforms are 9.5 and 5.7 mu s respectively. The AM value of peak amplitudes of the positive return strokes fields normalized to 100 km is 17.0 V/m. (C) 2012 Elsevier Ltd. All rights reserved.
%@area CST
%@electronicmailaddress
%@electronicmailaddress marcelo.saba@inpe.br
%@e-mailaddress marcelo.pazos@inpe.br
%@documentstage not transferred
%@group GESATM-CEA-SPG-INPE-MCTI-GOV-BR
%@group CST-CST-INPE-MCTI-GOV-BR
%@dissemination WEBSCI; PORTALCAPES; AGU; MGA; COMPENDEX; SCOPUS.
%@usergroup administrator
%@usergroup marcelo.pazos@inpe.br
%@usergroup simone
%@nexthigherunit 8JMKD3MGPCW/3F2PBEE
%@nexthigherunit 8JMKD3MGPCW/3F3T29H
%@resumeid
%@resumeid 8JMKD3MGP5W/3C9JHP6
%@affiliation INPE, BR-12201970 Sao Jose Dos Campos, SP, Brazil.
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation INPE, BR-12201970 Sao Jose Dos Campos, SP, Brazil.
%@affiliation OVE ALDIS, A-1190 Vienna, Austria.
%@versiontype publisher
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%@doi 10.1016/j.jastp.2012.09.008
%@tertiarymark Trabalho Vinculado à Tese/Dissertação
%2 sid.inpe.br/mtc-m19/2013/06.12.01.41.03