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| Titel |
Long-term changes in the North-South asymmetry of solar activity: a nonlinear dynamics characterization using visibility graphs |
| VerfasserIn |
Y. Zou, R. V. Donner, N. Marwan, M. Small, J. Kurths |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2198-5634
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics Discussions ; 1, no. 1 ; Nr. 1, no. 1 (2014-04-15), S.665-703 |
| Datensatznummer |
250115089
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| Publikation (Nr.) |
 copernicus.org/npgd-1-665-2014.pdf |
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| Zusammenfassung |
| Solar activity is characterized by complex dynamics superimposed to an almost
periodic, about 11 years cycle. One of its main features is the presence of a
marked, time-varying hemispheric asymmetry, the deeper reasons of 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 potentials 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. |
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