Modulação de raios cósmicos em diferentes escalas temporais e sua variação com eventos transientes solares

• Ano de defesa: 2016
• Autor(a) principal: Tueros-cuadros, Edith
• Orientador(a): Correia, Emilia
• Banca de defesa: Válio, Adriana Benetti Marques , Mendonça, Rafael Rodrigues Souza de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Presbiteriana Mackenzie
• Programa de Pós-Graduação: Ciências e Aplicações Geoespaciais
• Departamento: Engenharia
• País: BR
• Palavras-chave em Português: raios cósmicos; correção atmosférica; temperatura ponderada pela massa; ejeção de massa coronal (CME); decréscimo Forbush
• Palavras-chave em Inglês: cosmic rays; atmospheric correction; mass average temperature; coronal mass ejection; Forbush decrease
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS
• Link de acesso: http://dspace.mackenzie.br/handle/10899/24131

Cosmic rays are strongly influenced by solar, geomagnetic and atmospheric phenomena. CARPET detector, conceived for cosmic rays observation with energies in the range between 105 - 1012 eV, is an important tool for the study of these phenomena. The Earth s atmosphere conditions are also affected by changes in the cosmic rays flux, therefore, cosmic rays characterization is important to define physical and chemical conditions of our atmosphere. To characterize the cosmic rays flux variations, detected on the ground, prior elimination of atmospheric pressure and temperature effects on ground level is needed, thus, data recorded by meteorological instruments on CASLEO were used for that corrections. To eliminate the effect of temperature through the whole vertical atmosphere it was applied the integral and the mass-average temperature method by using vertical temperature profiles. Both methods were tested using CARPET-TEL data for the year 2009, this data were previously corrected by pressure influences. The mass-average temperature method shows a better response when comparing the corrected CARPET date with neutron monitor observations .The whole cosmic rays flux data analysis, for CARPET-TEL data corrected by integral method (for the period 2006/04/01 - 2014/06/30), shows an anti-correlation with sunspot number and a clear seasonal variation after 2008. Two Forbush decreases (FD), were detected by CARPET which were produced by geo-effective CMEs. Both FD onsets coincided with the interplanetary shock instant, which preceded intense geomagnetic storms. With these results, we can reinforce that CARPET is an important tool to study long and short term cosmic rays behavior, because it has a similar response to experiments that operates at atmosphere particle energy ranges.