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Schlagwörter:
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Zusammenfassung:
Solar activity is characterized by complex dynamics
superimposed onto an almost periodic, approximately
11-year cycle. One of its main features is the presence of
a marked, time-varying hemispheric asymmetry, the deeper
reasons for which have not yet been completely uncovered.
Traditionally, this asymmetry has been studied by considering
amplitude and phase differences. Here, we use visibility
graphs, a novel tool of nonlinear time series analysis, to
obtain complementary information on hemispheric asymmetries
in dynamical properties. Our analysis provides deep insights
into the potential and limitations of this method, revealing
a complex interplay between factors relating to statistical
and dynamical properties, i.e., effects due to the probability
distribution and the regularity of observed fluctuations.
We demonstrate that temporal changes in the hemispheric
predominance of the graph properties lag those directly
associated with the total hemispheric sunspot areas.
Our findings open a new dynamical perspective on studying the north–south sunspot asymmetry, which is to be further explored in future work.
