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 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.
© European Southern Observatory (ESO) 2000
Online publication: December 5, 2000