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Influence of solar, geomagnetic and atmospheric activities in cosmic ray flux modulation.

Grant number: 09/11935-5
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): March 01, 2010
Effective date (End): February 28, 2011
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geophysics
Principal Investigator:Jean Pierre Raulin
Grantee:Rafael Rodrigues Souza de Mendonça
Host Institution: Escola de Engenharia (EE). Universidade Presbiteriana Mackenzie (UPM). Instituto Presbiteriano Mackenzie. São Paulo , SP, Brazil


The modulation of cosmic ray flux presents different timescales associated with the solar activity cycle and geomagnetic transient events. A detailed comparison with solar indices like sunspot number and mean solar disk magnetic field can bring information on the magnetic cycle of 22 years and new ideas about the current atypical minimum of solar activity. Cosmic Rays are known to be at the origin, or at least to drive and modify atmospheric phenomena on Earth. Cosmic Rays may be related to the formation of clouds, and can have an important role in the global electric circuit and its time evolution, making the overall study of these relations of great importance for a better understanding of Earths' climatic processes. On the other hand, precipitation of rain water and changes of the atmospheric electric field, phenomena associated with cloud formation and the behavior of the global electric circuit, may change the flux of observed cosmic rays. In this work we propose to study the modulation of cosmic ray flux in multiple times scales associated with solar and geomagnetic activities and to analyze the influence of precipitated rain and atmospheric electric field in the detected count of cosmic rays recorded by the detector CARPET.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DE MENDONCA, R. R. S.; RAULIN, J. -P.; ECHER, E.; MAKHMUTOV, V. S.; FERNANDEZ, G.. Analysis of atmospheric pressure and temperature effects on cosmic ray measurements. JOURNAL OF GEOPHYSICAL RESEARCH, v. 118, n. 4, p. 1403-1409, . (09/11935-5)
DE MENDONCA, R. R. S.; RAULIN, J. -P.; BERTONI, F. C. P.; ECHER, E.; MAKHMUTOV, V. S.; FERNANDEZ, G.. Long-term and transient time variation of cosmic ray fluxes detected in Argentina by CARPET cosmic ray detector. JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, v. 73, n. 11-12, SI, p. 1410-1416, . (07/05630-1, 09/11935-5)

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