Anomalia equatorial de ionização e a propagação de sinais de rádio

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dc.contributor.advisorCorreia, Emilia
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/1272123236892781por
dc.contributor.authorSilva, Gilmar Alves
dc.creator.Latteshttp://lattes.cnpq.br/8020534302208098por
dc.date.accessioned2018-04-04T11:49:28Z
dc.date.accessioned2020-05-28T18:15:03Z
dc.date.available2020-05-28T18:15:03Z
dc.date.issued2018-01-31
dc.description.abstractThe ionosphere plays an important role in the propagation of electromagnetic waves, providing valvable opportunity to study its variability and effects on radio signals. The continuous changing in the ionospheric conditions caused by space weather strongly affects the propagation of electromagnetic waves, particularly in high frequency (HF).This work aims to investigate the propagation of radio signals in the equatorial region, between November 2013 to October 2014 in the following frequencies: 1,8 MHz, 14 MHz, 28 MHz and 50 MHz. The study was performed using DPS4 digisonde data, propagation model (VOACAP) and amateur radio receivers. The work consists of radio signals analysis emitted by two amateur radio stations located in Punta Arenas (latitude: 53.15°S; longitude: 70.92°W; dip. latitude: 39.37ºS) and in Nairóbi (latitude: 1.28ºS; longitude: 36.88ºE; dip. latitude: 10.74ºS). These radio signals were recorded at the amateur radio receiving stations located in Boa Vista (latitude: 2.82°N; longitude: 60.76°W; dip. latitude: 15,14ºN), Campo Grande (latitude: 20.5oS; longitude: 54.7oW; dip. latitude: 16.99ºS) and São Luís (latitude: 2.53oS; longitude: 44.30oW; dip. latitude: 3.28ºS) located in the region of the equatorial ionization anomaly (EIA) and at the magnetic equator in the Brazilian sector. It was emphasized the analysis of the maximum usable frequency (MUF) obtained from the foF2 ionospheric parameter and the signal-to-noise ratio (SNR) in each path between radio amateur transmitters (Tx) and the receivers (Rx). Results indicate that the ionosphere response was different in relation to the radio signals that propagate in and out of the equatorial region. According to SNR values measured at the receiving stations, The communications in 1.8 MHz were only possible at evenings of winter months between Punta Arenas and Boa Vista and between Punta Arenas an Sao Luis. The communications in 14 MHz were possible on all routes during the summer months and during equinoxes period at any hour of the day, but during the winter period the transmissions from Punta Arenas were only received in São Luís and Campo Grande during daylight hours. The 28 MHz transmissions from Nairobi were received during the summer months in all stations 24 hours by day, but transmissions at the same frequency from Punta Arenas only were received in São Luís and Campo Grande. At other times of the year the communications over the same frequency were only possible during daylight hours. The communications in 50 MHz were only possible in the summer months coming from Nairobi station.eng
dc.formatapplication/pdf*
dc.identifier.citationSILVA, Gilmar Alves. Anomalia equatorial de ionização e a propagação de sinais de rádio. 2018. 155 p. Tese( Ciências e Aplicações Geoespaciais) - Universidade Presbiteriana Mackenzie, São Paulo.por
dc.identifier.urihttp://dspace.mackenzie.br/handle/10899/25797
dc.keywordsMUFeng
dc.keywordsionosphereeng
dc.keywordsequatorial ionization anomalyeng
dc.keywordstransequatorial propagationeng
dc.keywordspropagation of radio signalseng
dc.languageporpor
dc.publisherUniversidade Presbiteriana Mackenziepor
dc.rightsAcesso Abertopor
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectMUFpor
dc.subjectionosferapor
dc.subjectanomalia equatorial de ionizaçãopor
dc.subjectpropagação transequatorialpor
dc.subjectpropagação de sinais de rádiopor
dc.subject.cnpqCNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DA MATERIA CONDENSADA::PROP.OTICAS E ESPECTROSC.DA MAT.CONDENSOUTRAS INTER.DA MAT.COM RAD.E PART.por
dc.subject.cnpqCNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA GERALpor
dc.subject.cnpqCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOFISICA::AERONOMIApor
dc.thumbnail.urlhttp://tede.mackenzie.br/jspui/retrieve/15941/Gilmar%20Alves%20Silva.pdf.jpg*
dc.titleAnomalia equatorial de ionização e a propagação de sinais de rádiopor
dc.typeTesepor
local.contributor.board1Meneses Junior, Francisco Carlos de
local.contributor.board1Latteshttp://lattes.cnpq.br/3741365096483054por
local.contributor.board2Vieira, Marcos Stefanelli
local.contributor.board2Latteshttp://lattes.cnpq.br/7586109476484841por
local.contributor.board3Araújo, Roberto Câmara de
local.contributor.board3Latteshttp://lattes.cnpq.br/1402033627586412por
local.contributor.board4Durães, Francisco de Oliveira
local.contributor.board4Latteshttp://lattes.cnpq.br/5454001401250454por
local.publisher.countryBrasilpor
local.publisher.departmentEscola de Engenharia Mackenzie (EE)por
local.publisher.initialsUPMpor
local.publisher.programCiências e Aplicações Geoespaciaispor
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