TY  - JOUR
A1  - Zolotova, Nadezhda V.
A1  - Ponyavin, Dmitri I.
A1  - Marwan, Norbert
A1  - Kurths, Jürgen
T1  - Long-term asymmetry in the wings of the butterfly diagram
N2  - Aims. Sunspot distribution in the northern and southern solar hemispheres exibit striking synchronous behaviour on the scale of a Schwabe cycle. However, sometimes the bilateral symmetry of the Butterfly diagram relative to the solar equatorial plane breaks down. The investigation of this phenomenon is important to explaining the almost-periodic behaviour of solar cycles. Methods. We use cross-recurrence plots for the study of the time-varying phase asymmetry of the northern and southern hemisphere and compare our results with the latitudinal distribution of the sunspots. Results. We observe a long-term persistence of phase leading in one of the hemispheres, which lasts almost 4 solar cycles and probably corresponds to the Gleissberg cycle. Long-term variations in the hemispheric-leading do not demonstrate clear periodicity but are strongly anti-correlated with the long-term variations in the magnetic equator.
Y1  - 2009
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/32023
UR  - http://www.aanda.org/
SN  - 0004-6361
ER  -