Estudo da atividade solar no passado em função da radiação cósmica

Abstract

The study about cosmic radiation arriving the Earth represents an important register of its variations, as the physical phenomena who cause these variations. In the solar system the variation is strongly modulated by the Sun's magnetic field through the solar wind. This modulation makes that occurs an inverse correlation between cosmic rays and solar activity. When the cosmic rays arrive in Earth’s atmosphere they interact with the atmosphere and produce the Atmospheric Cosmonuclides, like the Carbon-14 (14C) , and Beryllium-10 (10Be), among others. Thus studying the records of this cosmonuclides (on tree rings, and on ice cores) we will be able to obtain information about the solar activity in the past, once this must show an inverse correlation with the Atmospheric Cosmonuclides. In this work it used time series about cosmic radiation arriving the Earth ( using the Atmospheric Cosmonucliedes 14C and 10Be), as representative data of solar activity (sunspot numbers). The used time series have a yearly temporal resolution. In the time series study was used mathematical analysis of correlation methods and linear regression, as the method of iterative regression, to the reconstruction of solar activity in the past by the Atmospheric Cosmonuclides. As the result of these regressions key periods were obtained of the solar activity in the last 1000 years, as the minimum periods of Spörer, Maunder, Dalton, Wolf and the maximum Medieval period. In addition solar activity regressions was generated with module of correlation degree up to 0,74.