Cosmic Ray
Mostrando 1-12 de 37 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. Study of solar-interplanetary-geomagnetic disturbances using data from the Global Muon Detector Network and the LASCO coronagraph / Estudo de disturbios solar-interplanetário-geomagnéticos usando Dados da Rede Mundial de Detectores de Muons e do coronógrafo LASCO
O objetivo do trabalho da Dissertação é estudar distúrbios solar-interplanetário-geomagnéticos, como ejeções de massa coronais solares (Coronal Mass Ejections - CMEs) usando observações de coronógrafos de luz branca e de raios cósmicos de alta energia (muons). A partir de imagens do coronógrafo LASCO-C3 (Large Angle and Spectroscopic Coronagraph
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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3. Dark Energy and The Accelerating Universe: Conceptual Aspects and Observational Tests / Energia escura e aceleração do Universo: Aspectos conceituais e testes observacionais
In the last decade, the extraordinary progress of the astronomical observations (distances with supernovas, matter and cosmic background radiation (CBR) power spectrum, X-ray surface brightness of galaxy clusters, etc) associated with important theoretical developments turned Cosmology one of the most exciting frontiers of contemporary science. In this thesi
Publicado em: 2010
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4. Cosmic ray Ground Level Enhancements (GLEs) of october 28, 2003 and january 20, 2005: a simple comparison
A evolução do aumento de raios cósmicos na superfície terrestre (GLE) no dia 28 de outubro de 2003 (evento Halloween) e outro evento subseqüente no dia 20 de janeiro de 2005 (um evento grande em fase de declínio da atividade solar) foram examinados. O GLE no dia 28 de outubro foi notado pequeno, porém a diminuição Forbush e o índice Dst no dia segu
Revista Brasileira de Geofísica. Publicado em: 2009-06
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5. The Origin and Evolution of Cosmic Magnetic Fields / Origem e evolução dos campos magnéticos cosmológicos
Campos magnéticos de intensidade $\sim \mu$G são observados tanto em nossa galáxia, quanto em galáxias com alto desvio para o vermelho (\emph{z}), onde o dínamo $\alpha-\Omega$ não deveria ter tempo para produzi-lo. Por conseguinte, uma origem primordial é indicada. Foi proposto que os campos primordiais surgiram em várias eras: durante a inflação,
Publicado em: 2009
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6. Cosmic ray intensity during the passage of coronal mass ejections
Coronal Mass Ejections are vast structures of plasma and magnetic fields that are expelled from the sun into the heliosphere. This material is detected by remote sensing and in-situ spacecraft observations. The present study deals with the influence of four types of CMEs namely Asymmetric 'Full' Halo CMEs, Partial Halo CMEs, Asymmetric and Complex 'Full' Hal
Brazilian Journal of Physics. Publicado em: 2008-12
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7. New analyses of double-bang events in the atmosphere
We use CORSIKA+Herwig simulation code to produce ultra-high energy neutrino interactions in the atmosphere. Our aim is to reproduce extensive air showers originated by extragalactic tau-neutrinos. For charged current tau-neutrino interactions in the atmosphere, beside the air shower originated from the neutrino interaction, it is expected that a tau is creat
Brazilian Journal of Physics. Publicado em: 2008-06
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8. Modulation of cosmic rays at different cutoff rigidity
The present work deals with the study of first three harmonics of cosmic ray intensity on geo-magnetically quiet days over the period 1981-1993 for Deep River and Inuvik neutron monitoring stations having mid and low cutoff rigidity. The amplitude of first harmonic remains high for Deep River having mid cutoff rigidity as compared to Inuvik neutron monitor h
Brazilian Journal of Physics. Publicado em: 2008-03
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9. Quark matter (strangelets) from astrophysical sources and its detection by terrestrial experiments. / Matéria de quarks (strangelets) de origem astrofísica e sua detecção por experimentos terrestres
The strange quark matter hypothesis, which states that a plasma composed of quarks up, down and strange in roughly equal amounts is absolutely stable at zero pressure, has been studied for more than twenty years, both theoretically and during searches for its detection in specific experiments. If strange quark matter is indeed stable, then there could be imp
Publicado em: 2008
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10. Simulações do ruído de fundo instrumental e reconstrução de imagens do experimento protoMIRAX / Simulations of the instrumental background and image reconstruction of the protoMIRAX experiment
In this thesis, the results of detailed and realistic simulations performed with a Monte Carlo simulation code for gamma-ray Astronomy (MGGPOD) to predict the response of protoMIRAX are presented. The protoMIRAX is a project under development by the High Energy Astrophysics group of INPE, in which a hard X-ray camera is being built based on the coded apertur
Publicado em: 2008
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11. Reconstrução de chuveiros atmosfericos extensos detectados pelo Observatorio Pierre Auger utilizando metodos robustos / Reconstruction of extensive air showers seen by the Pierre Auger Observatory using robust methods
Desde os primeiros Raios Cósmicos de alta energia detectados por Pierre Auger na década de 30, toda a comunidade de Física de Radiação Cósmica procura técnicas matemáticas e métodos estatísticos mais adequados para analisar estes eventos. Estes processos de análise são imprescindíveis na estimativa da energia da partícula primária, bem como no
Publicado em: 2008
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12. Cosmic ray anisotropy and solar activity
In this paper an attempt is made to study the occurrence of a large number of high amplitude anisotropic wave train events in cosmic ray intensity during 1981-1994 and to identify a possible correlation with solar activity using the hourly neutron monitor data of Deep River station. The diurnal time of maximum for both HAE as well as for all days is found to
Brazilian Journal of Physics. Publicado em: 2007-12