Polarização das emissões solares em comprimentos de onda milimétricos

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dc.contributor.advisorValio, Adriana Benetti Marques
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/1041565102315246por
dc.contributor.authorHidalgo Ramírez, Ray Fernando
dc.creator.Latteshttp://lattes.cnpq.br/1870195747044351por
dc.date.accessioned2020-09-17T14:21:54Z
dc.date.accessioned2020-12-07T15:09:56Z
dc.date.available2020-12-07T15:09:56Z
dc.date.issued2019-08-26
dc.description.abstractPolarization of radio emissions from solar bursts provides essential information about confined plasma regimes submitted to magnetic field in quiescent, pre-explosion, sudden energy release and decay phases. Investigations at microwaves and longer wavelengths have widely been carried out. Observations of polarization are carried out continuously by the first time at two millimeter wavelengths by two solar radio polarimeters named POEMAS at 45 and 90 GHz (6.6 and 3.3 mm, respectively) operating at El Leoncito Observatory, Argentina Andes. The present research is divided in two parts. First, the center-to-limb variation of polarization of solar bursts is investigated. A total of 30 bursts observed by the radio polarimeters, between 2012 and 2013, were analyzed. We show increasing degreeofpolarizationwithheliocentricangle,butatapproximately50∘ aturnover isobservedwiththedegreeofpolarizationbeginningtodecreaseforlargerangles. We also found a weak correlation between bursts flux density and their heliocentricangle,i.e.solarburstswithhigherfluxdensitytendtooccurclosertothelimb. To interpret the observational results, a numerical simulation of the polarization degree spectra for gyro-synchrotron emission was performed. As for the second part of this research, the S-component time evolution at millimeter wavelengths of a active region throughout the solar disk is studied. We observe flux enhancementswiththepassageoftheactiveregionwithaspectralindex,atthemaximum, between 2-6 taking into account the measurement of errors. This double spectrum of active region emission at radio wavelengths can favor a core-halo distribution ofradiobrightnessoveractiveregions.Anenhancementinthedegreeofpolarization of about 40 % is observed in the second half of the active region transit at 45 GHz, however, it is disregarded due to the error propagation. Also, no significant enhancement in the degree of polarization is observed at 90 GHz.eng
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superiorpor
dc.description.sponsorshipFundação de Amparo a Pesquisa do Estado de São Paulopor
dc.description.sponsorshipFundo Mackenzie de Pesquisapor
dc.formatapplication/pdf*
dc.identifier.citationHIDALGO RAMÍREZ, Ray Fernando. Polarização das emissões solares em comprimentos de onda milimétricos. 2019. 80 f. Tese (Ciências e Aplicações Geoespaciais) - Universidade Presbiteriana Mackenzie, São Paulo, 2019.por
dc.identifier.urihttp://dspace.mackenzie.br/handle/10899/26625
dc.keywordssolar burstseng
dc.keywordscenter-to-limb variationseng
dc.keywordspolarizationeng
dc.keywordsS-componenteng
dc.languageporpor
dc.publisherUniversidade Presbiteriana Mackenziepor
dc.rightsAcesso Abertopor
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectexplosões solarespor
dc.subjectvariação centro-ao-limbopor
dc.subjectpolarizaçãopor
dc.subjectcomponente-5por
dc.subject.cnpqCNPQ::CIENCIAS EXATAS E DA TERRA::ASTRONOMIA::ASTROFISICA DO SISTEMA SOLAR::FISICA SOLARpor
dc.subject.cnpqCNPQ::CIENCIAS EXATAS E DA TERRA::FISICApor
dc.titlePolarização das emissões solares em comprimentos de onda milimétricospor
dc.typeTesepor
local.contributor.board1Raulin, Jean Pierre
local.contributor.board1Latteshttp://lattes.cnpq.br/7285541024719915por
local.contributor.board2Simões, Paulo Jose de Aguiar
local.contributor.board2Latteshttp://lattes.cnpq.br/9281522944369099por
local.contributor.board3Costa, Joaquim Eduardo Rezende
local.contributor.board3Latteshttp://lattes.cnpq.br/7275059047419031por
local.contributor.board4Selhorst, Caius Lucius
local.contributor.board4Latteshttp://lattes.cnpq.br/0755434903205461por
local.publisher.countryBrasilpor
local.publisher.departmentEscola de Engenharia Mackenzie (EE)por
local.publisher.initialsUPMpor
local.publisher.programCiências e Aplicações Geoespaciaispor
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