Long-term asymmetry in the wings of the butterfly diagram

Details Long-term asymmetry in the wings of the butterfly diagram Long-term asymmetry in the wings of the butterfly diagram

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...503..197z&link_type=abstract

Astronomy and Astrophysics, Volume 503, Issue 1, 2009, pp.197-201

Astronomy and Astrophysics

Astrophysics

8

Sun: Activity, Sun: Sunspots, Sun: Magnetic, Fields

Scientific paper

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.

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