Sunspot
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Influência das variabilidades solar, geomagnética e atmosférica na modulação da intensidade de raios cósmicos / Influence of solar, geomagnetic and atmospheric activities in cosmic ray intensity modulation
Cosmic ray is influenced by solar, geomagnetic and atmospheric phenomena. In this Thesis are presented studies with the cosmic ray data regarded by the CARPET detector, which is installed in the Argentinean Andes, between 2006 and 2008. The variations in the cosmic ray count rate related to rain, temperature, atmospheric pressure and atmospheric electric fie
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/05/2011
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2. Posicionamento por GPS na região brasileira durante a intensa tempestade geomagnética de 29 de outubro de 2003
The error due to the ionosphere in the GPS observables depends on the Total Electron Content (TEC) in the ionospheric layer. The TEC varies regularly in time and space in relation to the sunspot number, the season, the local time, the geographic position, and others. However, the TEC can suffer abrupt modifications in its behavior due to the occurrence of in
Publicado em: 2010
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3. Dinâmica populacional de Halodule wrightii Ascherson e sua fauna e flora associada em Cabo Frio RJ / Population dynamics of halodule wrightii Ascherson and their associated fauna and flora at Cabo Frio - RJ
Fanerógamas marinhas (gramas marinhas) são plantas com flores adaptadas ao ambiente marinho costeiro da maioria dos continentes do mundo. As gramas marinhas formam extensos bancos e proveem valiosos recursos em águas costeiras rasas em todo o mundo, servindo de alimento e berçário para espécies importantes de pescados comerciais e recreacionais. Nesse
Publicado em: 2010
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4. Analise de componentes ciclicas em series temporais uni e multivariadas via filtros HP modificados e outros metodos / Cycle components analysis for uni and multivariate time throug modified Hodrick-Prescott filters and other methods
The analysis of cycles in time series is considered in this investigation through four methodologies, of which three were more recently developed in literature. The first method, proposed in Kaiser and Maravall (2001), is based on a modification of the unidimensional Hodrick-Prescot filter (HP) through ARIMA models approach. The second method, developed in M
Publicado em: 2007
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5. Radiodifusão Local na Faixa de 26 MHz Usando DRM: Resultados de Testes em Brasília
The digitalization of the sound broadcasting systems is currently underway throughout the world. One of the systems available for such a process is Digital Radio Mondiale (DRM), which is currently designed to operate in frequencies below 30 MHz. Through the use of the DRM system, a much higher audio quality can be achieved than that of AM radio with the use
Publicado em: 2007
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6. Estudo estatístico da variabilidade dos índices geomagnéticos e sua relação com o ciclo solar / Statistical study of the variability of geomagnetic indices and its relation to the solar cicle
A study of the long-term relation between solar and geomagnetic activity is presented. For that purpose we have used of the annual and monthly sunspot number series (Rz) together with the aa geomagnetic index from 1868 to 2000. Furthermore, we have analized the Dst, AE and Ap indices (from 1957 to 2000), and solar wind speed. In this study, statistical analy
Publicado em: 2002
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7. A Note on Learning Chaotic Sunspot Equilibrium
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Fundação Getulio Vargas. Publicado em: 01/05/2001
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8. Oscilações MHD ideal em tubos de fluxo magnetico com variação radial ; : aplicações em fisica solar
In this work, we present the ideal magnetohydrodynamic (MHD) spectral analysis of a two-layered magnetic flux tube with radial variations. The two layers represent two regions with different physical characteristics and find many applications in astrophysical systems. Here we concentrate our attention on the study of solar magnetic flux tube oscillations. A
Publicado em: 1997
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9. EXTENSÃO DA COMPONENTE CÍCLICA DO MODELO ESTRUTURAL / EXTENDING THE CYCLICAL COMPONENT IN THE STRUCTURAL MODEL FORMULATION
The Structural Models, recently suggested by Harvey, uses the classic idea of modelling a time series y its non observed components. The cyclical component of the series, which is defined by a smoothed sine, is a special one that may be used for explaining a repetitive behaviour along the series. The motivation for using this component lies in the finite val
Publicado em: 1987
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10. Association between acute glaucoma and the weather and sunspot activity.
The dates of presentation of 191 cases of acute closed-angle glaucoma which presented at the Birmingham and Midland Eye Hospital between 1971 and 1974 were analysed and the seasonal incidence of acute glaucoma confirmed (P less than 0-001). These data were compared with meteorological data for air temperature, rainfall, hours of sunshine, atmospheric pressur
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11. Possible forcing of global temperature by the oceanic tides
An approximately decadal periodicity in surface air temperature is discernable in global observations from A.D. 1855 to 1900 and since A.D. 1945, but with a periodicity of only about 6 years during the intervening period. Changes in solar irradiance related to the sunspot cycle have been proposed to account for the former, but cannot account for the lat
The National Academy of Sciences of the USA.