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Solar cycles: the past evolution influence

Published online by Cambridge University Press:  26 February 2010

Alexis Klutsch  and
Rubens Freire Ferrero
Alexis Klutsch
Affiliation:
Universidad Complutense de Madrid, Departamento de Astrofísica, Facultad C.C. Físicas, 28040 Madrid, Spain, email: klutsch@astrax.fis.ucm.es Observatoire Astronomique, Université de Strasbourg & CNRS, UMR 7550, 11 rue de l'Université, 67000 Strasbourg, France, email: rubens.freire@astro.unistra.fr
Rubens Freire Ferrero
Affiliation:
Observatoire Astronomique, Université de Strasbourg & CNRS, UMR 7550, 11 rue de l'Université, 67000 Strasbourg, France, email: rubens.freire@astro.unistra.fr
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Abstract

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The so-called solar cycle is generally characterized by the quasi-periodic oscillatory evolution of the photospheric spots number. This quasi-periodic pattern has always been an intriguing question. Several physical models were proposed to explain this evolution and many mathematical data analysis were employed to determine the principal frequencies noticeable in the measured data. Both approaches try to predict the future evolution of the solar activity and to understand the physical phenomena producing these cycles. Here we present the analysis of the sunspots number evolution using the time-delay approach. Our results show than the solar cycle can also be characterized by this behavior implying the influence of the past evolution over the present one, suggesting an histeresis mechanism, linked probably with magnetic activity.

Keywords

Sun: sunspotsSun: activitySun: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S264: Solar and Stellar Variability: Impact on Earth and Planets , August 2009 , pp. 155 - 157
Copyright
Copyright © International Astronomical Union 2010

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