Please use this identifier to cite or link to this item: http://repositorio.unitau.br/jspui/handle/20.500.11874/2708
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dc.contributor.authorZanandrea, Apt_BR
dc.contributor.authorDa Costa, JMpt_BR
dc.contributor.authorDutra, SLGpt_BR
dc.contributor.authorTrivedi, NBpt_BR
dc.contributor.authorKitamura, Tpt_BR
dc.contributor.authorYumoto, Kpt_BR
dc.contributor.authorTachihara, Hpt_BR
dc.contributor.authorShinohara, Mpt_BR
dc.contributor.authorSaotome, Opt_BR
dc.date.accessioned2019-09-12T16:53:40Z-
dc.date.available2019-09-12T16:53:40Z-
dc.date.issued2004-
dc.citation.volume52pt_BR
dc.citation.issue13pt_BR
dc.citation.spage1209-
dc.citation.epage1215-
dc.identifier.doi10.1016/j.pss.2004.08.001pt_BR
dc.identifier.issn0032-0633-
dc.identifier.urihttp://repositorio.unitau.br/jspui/handle/20.500.11874/2708-
dc.description.abstractIn order to investigate Pc3-4 geomagnetic pulsations at very low and equatorial latitudes, L = 1.0 to 1.2, we analyzed simultaneous geomagnetic data from Brazilian stations for 26 days during October November 1994. The multitaper spectral method based on Fourier transform and singular value decomposition was used to obtain pulsation power spectra, polarization parameters and phase. Eighty-one (81) simultaneous highly polarized Pc3-4 events occurring mainly during daytime were selected for the study. The diurnal events showed enhancement in the polarized power density of about 3.2 times for pulsations observed at stations close to the magnetic equator in comparison to the more distant ones. The phase of pulsation observed at stations near the magnetic equator showed a delay of 48-62degrees in relation to the most distant one. The peculiarities shown by these Pc3-4 pulsations close to the dip equator are attributed to the increase of the ionospheric conductivity and the intensification of the equatorial electrojet during daytime that regulates the propagation of compressional waves generated in the foreshock region and transmitted to the magnetosphere and ionosphere at low latitudes. The source mechanism of these compressional Pc3-4 modes may be the compressional global mode or the trapped fast mode in the plasmasphere driving forced field line oscillations at very low and equatorial latitudes. (C) 2004 Elsevier Ltd. All rights reserved.en
dc.description.provenanceMade available in DSpace on 2019-09-12T16:53:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2004en
dc.languageInglêspt_BR
dc.publisherPergamon-Elsevier Science Ltd-
dc.publisher.countryInglaterrapt_BR
dc.relation.ispartofPlanetary and Space Science-
dc.rightsEm verificaçãopt_BR
dc.sourceWeb of Sciencept_BR
dc.subject.otherGeomagnetic Pulsationsen
dc.subject.otherMicropulsationsen
dc.subject.otherPc3-4 Pulsationsen
dc.subject.otherMultitaper Polarization Analysisen
dc.subject.otherUlf Hydromagnetic Wavesen
dc.subject.otherPc-3 Magnetic Pulsationsen
dc.subject.otherEquatorial Electrojeten
dc.subject.otherPolarization Analysisen
dc.subject.otherPrincipal Componentsen
dc.subject.otherConjugate Stationsen
dc.subject.otherDip Equatoren
dc.subject.otherMicropulsationsen
dc.subject.otherStatesen
dc.subject.otherWavesen
dc.titlePc3-4 geomagnetic pulsations at very low latitude in Brazilen
dc.typeArtigo de Periódicopt_BR
dc.identifier.wosWOS:000225310500007-
dc.description.affiliationITA, Elect Engn Div, IEE, BR-12228900 Sao Jose Dos Campos, SP, Brazil; Universidade de Taubaté (Unitau), Dept Math & Phys, BR-12020270 Taubate, SP, Brazil; INPE, Natl Inst Space Res, Div Space Geophys, DGE, BR-12201970 Sao Jose Dos Campos, Brazil; Kyushu Univ, Dept Earth & Planetary Sci, Fukuoka 812, Japan-
dc.subject.wosareaAstronomy & Astrophysicsen
dc.subject.researchareaAstronomy & Astrophysicsen
Appears in Collections:Artigos de Periódicos

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