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Astron. Astrophys. 363, 311-315 (2000)

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4. Conclusions

From wavelet analysis approach, we considered a measure of the disorder content of solar activity, following the temporal evolution of the so-called wavelet entropy . The analysis is performed on the monthly time series of sunspot numbers and shows an interesting multiscale evolution of the wavelet entropy. In particular, we found a clear increase in the disorder content of solar activity for the current [FORMULA] solar cycle. This result suggests general low accuracies reachable for current solar cycle prediction methods, which are based on some strong deterministic hypothesis. Finally, we suggested a possible strict correlation between the wavelet entropy qualitative behaviour and the solar excursion phases of solar dipole, linked to coronal complexity evolution.

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© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000
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