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Abstract: We investigate the phase difference of the sunspot cycles in the twohemispheres and compare it with the latitudinal sunspot distribution. If thenorth-south phase difference exhibits a long-term tendency, it should not beregarded as a stochastic phenomenon.We use datasets of historical sunspot records and drawings made byStaudacher, Hamilton, Gimingham, Carrington, Spouml;rer, and Greenwichobservers, as well as the sunspot activity during the Maunder minimumreconstructed by Ribes and Nesme-Ribes.We employ cross-recurrence plots to analyse north-south phase differences. Weshow that during the last 300 years, the persistence of phase-leading in one ofthe hemispheres exhibits a secular variation. Changes from one hemisphere tothe other leading in phase were registered near 1928 and 1968 as well as twohistorical ones near 1783 and 1875.A long-term anticorrelation between the hemispheric phase differences in thesunspot cycles and the latitudinal distribution of sunspots was traced since1750.



Autor: N.V. Zolotova, D.I. Ponyavin, R. Arlt, I. Tuominen

Fuente: https://arxiv.org/



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