Analysis of Cosmic Rays' Atmospheric Effects and Their Relationships to Cutoff Rigidity and Zenith Angle Using Global Muon Detector Network Data

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Mendonca, R. R. S. ^{[1, 2]} ; Wang, C. ^[2] ; Braga, C. R. ^[1] ; Echer, E. ^[1] ; Dal Lago, A. ^[1] ; Costa, J. E. R. ^[1] ; Munakata, K. ^[3] ; Li, H. ^[2] ; Liu, Z. ^[2] ; Raulin, J-P ^[4] ; Kuwabara, T. ^[5] ; Kozai, M. ^[6] ; Kato, C. ^[3] ; Rockenbach, M. ^[1] ; Schuch, N. J. ^[1] ; Al Jassar, H. K. ^[7] ; Sharma, M. M. ^[7] ; Tokumaru, M. ^[8] ; Duldig, M. L. ^[9] ; Humble, J. E. ^[9] ; Evenson, P. ^[10] ; Sabbah, I ^[11]

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^[1] Natl Inst Space Res, Sao Jose Dos Campos, SP - Brazil

^[2] Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing - Peoples R China

^[3] Shinshu Univ, Phys Dept, Matsumoto, Nagano - Japan

^[4] Univ Prebiteriana Mackenzie, Engn Sch, Tenter Radio Astron & Astrophys Mackenzie, Sao Paulo, SP - Brazil

^[5] Chiba Univ, Grad Sch Sci, Chiba - Japan

^[6] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa - Japan

^[7] Kuwait Univ, Phys Dept, Kuwait - Kuwait

^[8] Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi - Japan

^[9] Univ Tasmania, Sch Nat Sci, Hobart, Tas - Australia

^[10] Univ Delaware, Dept Phys & Astron, Bartol Res Inst, Newark, DE 19716 - USA

^[11] Publ Author Appl Educ & Training, Coll Technol Studies, Dept Appl Sci, Shuwaikh - Kuwait

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS; v. 124, n. 12 DEC 2019.
• Citações Web of Science: 0

Resumo

Cosmic rays are charged particles whose flux observed at Earth shows temporal variations related to space weather phenomena and may be an important tool to study them. The cosmic ray intensity recorded with ground-based detectors also shows temporal variations arising from atmospheric variations. In the case of muon detectors, the main atmospheric effects are related to pressure and temperature changes. In this work, we analyze both effects using data recorded by the Global Muon Detector Network, consisting of four multidirectional muon detectors at different locations, in the period between 2007 and 2016. For each Global Muon Detector Network directional channel, we obtain coefficients that describe the pressure and temperature effects. We then analyze how these coefficients can be related to the geomagnetic cutoff rigidity and zenith angle associated with cosmic ray particles observed by each channel. In the pressure effect analysis, we found that the observed barometric coefficients show a very clear logarithmic correlation with the cutoff rigidity divided by the zenith angle cosine. On the other hand, the temperature coefficients show a good logarithmic correlation with the product of the cutoff and zenith angle cosine after adding a term proportional to the sine of geographical latitude of the observation site. This additional term implies that the temperature effect measured in the Northern Hemisphere detectors is stronger than that observed in the Southern Hemisphere. The physical origin of this term and of the good correlations found in this analysis should be studied in detail in future works. (AU)

• Processo FAPESP: 17/21270-7 - Forças atuantes na propagação de ejeções coronais de massa
• Beneficiário: Carlos Roberto Braga
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 14/24711-6 - Estudo conjunto de ejeções coronais de massa e suas estruturas correspondentes nas vizinhanças da Terra
• Beneficiário: Carlos Roberto Braga
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/21657-1 - Estudo da variabilidade da atividade auroral em rádio da magnetosfera de Júpiter
• Beneficiário: Ezequiel Echer
• Modalidade de apoio: Auxílio à Pesquisa - Regular