Please use this identifier to cite or link to this item: http://repositorio.unitau.br/jspui/handle/20.500.11874/2638
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dc.contributor.authorZanandrea, Apt_BR
dc.contributor.authorDa Costa, JMpt_BR
dc.contributor.authorDutra, SLGpt_BR
dc.contributor.authorRosa, RRpt_BR
dc.contributor.authorSaotome, Opt_BR
dc.date.accessioned2019-09-12T16:53:34Z-
dc.date.available2019-09-12T16:53:34Z-
dc.date.issued2004-
dc.citation.volume30pt_BR
dc.citation.issue8pt_BR
dc.citation.spage797-
dc.citation.epage808-
dc.identifier.doi10.1016/j.cageo.2004.03.016pt_BR
dc.identifier.issn0098-3004-
dc.identifier.issn1873-7803-
dc.identifier.urihttp://repositorio.unitau.br/jspui/handle/20.500.11874/2638-
dc.description.abstractSpectral and polarization parameters of geomagnetic pulsations are computed from geomagnetic data recorded at ground station, using multitaper and singular value decomposition (SVD) analysis. These techniques were adapted to provide appropriate polarization parameters of pulsations. The spectra are comparable to those obtained from classical methods, but the dynamic spectra of degree of polarization present more localized spectral information, allowing easier identification of polarized pulsation events mixed to noise, which are associated by coherent sources of MHD waves. The time-frequency polarization parameters of polarized pulsations show different signatures to regular and irregular pulsation events, and the multiwavelet polarization method is used to compare with multitaper. The regular pulsation events showed to be more continuous on time with a narrow spectral frequency band, while the irregular events showed to be more localized on time with a wide spectral frequency band. The dynamic analysis of multitaper method is indicated to characterize regular pulsations and the time-frequency analysis of multiwavelet method efficiently detects irregular pulsations. The continuous multiwavelet analysis of ellipticity and azimuth is useful in progressively monitoring the propagations of MHD waves in the magnetosphere, mainly in the irregular pulsations as observed on the magnetic storm of March 24, 1991. (C) 2004 Elsevier Ltd. All rights reserved.en
dc.description.provenanceMade available in DSpace on 2019-09-12T16:53:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2004en
dc.languageInglêspt_BR
dc.publisherPergamon-Elsevier Science Ltd-
dc.publisher.countryInglaterrapt_BR
dc.relation.ispartofComputers & Geosciences-
dc.rightsEm verificaçãopt_BR
dc.sourceWeb of Sciencept_BR
dc.subject.otherMultitaperen
dc.subject.otherMultiwaveletsen
dc.subject.otherPolarization Analysisen
dc.subject.otherGeomagnetic Pulsationsen
dc.subject.otherMultichannel Geophysical-Dataen
dc.subject.otherHigh-Frequency Seismogramsen
dc.subject.otherPrincipal Componentsen
dc.subject.otherFourier-Analysisen
dc.subject.otherStatesen
dc.subject.otherWavesen
dc.subject.otherMicropulsationsen
dc.subject.otherUncertaintyen
dc.subject.otherMultipleen
dc.subject.otherMatrixen
dc.titleSpectral and polarization analysis of geomagnetic pulsations data using a multitaper methoden
dc.typeArtigo de Periódicopt_BR
dc.identifier.wosWOS:000225367100001-
dc.description.affiliationNatl Inst Space Res, ITA, Elect Engn Div, IEE, BR-12228900 Sao Jose Dos Campos, SP, Brazil; Natl Inst Space Res, DGE, Dept Geophys, BR-12201970 Sao Jose Dos Campos, SP, Brazil; Universidade de Taubaté (Unitau), Dept Math & Phys, BR-12020270 Taubate, SP, Brazil; Natl Inst Space Res, LAC, Lab Comp & Appl Math, BR-12201970 Sao Jose Dos Campos, SP, Brazil-
dc.subject.wosareaComputer Science, Interdisciplinary Applicationsen
dc.subject.wosareaGeosciences, Multidisciplinaryen
dc.subject.researchareaComputer Scienceen
dc.subject.researchareaGeologyen
Appears in Collections:Artigos de Periódicos

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