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North-south asynchrony and long-term variations of sunspot latitudes

Published online by Cambridge University Press:  01 November 2008

Nadezhda V. Zolotova
Affiliation:
Institute of Physics, Saint-Petersburg State University, Russia email: ned@geo.phys.spbu.ru
D. I. Ponyavin
Affiliation:
Institute of Physics, Saint-Petersburg State University, Russia email: ned@geo.phys.spbu.ru
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Abstract

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The long-term records of sunspot area available separately for Northern and Southern Hemispheres have been investigated by means of cross-recurrence technique. Phase component of the north-south asymmetry was extracted. This measure demonstrates long-period systematic variations with the sign change of hemispheric leading in 1930s and 1960s. Moreover phase north-south asynchrony anticorrelates with the so called magnetic equator, which was defined as difference of the mean sunspot latitudes between two hemispheres. Relationships of the phase north-south asynchrony, magnetic equator and butterfly diagrams are presented and discussed.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

References

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