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Nonlinear analysis of solar cycles
Received 27 October 1998 / Accepted 11 May 2000
In this paper, the recent improvement of the Wolf sunspot time-series by Hoyt and co-workers has been analysed with the Global Flow Reconstruction (GFR) method (Serre et al. 1996a and b). A nonlinear 4-dimensional chaotic model has been extracted from the data which captures the principal characteristic features of the sunspot group time-series. The hypothesis of interactions between magnetic modes is implicitly tested; presumably, this is the cause of the irregular variations of solar cycle amplitudes recorded since the year 1610. The present results indicate that interactions are occurring between few global magnetic modes.
Key words: chaos methods: data analysis Sun: sunspots
Send offprint requests to: T. Serre (Thierry.Serre@Wanadoo.fr)
Online publication: July 27, 2000