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Nature of the unusually long solar cycles

Published online by Cambridge University Press:  26 August 2011

Nadezhda Zolotova  and
Dmitri Ponyavin
Nadezhda Zolotova
Affiliation:
Institute of Physics, St. Petersburg State University, 198504 St. Petersburg, Russia email: [email protected]
Dmitri Ponyavin
Affiliation:
Institute of Physics, St. Petersburg State University, 198504 St. Petersburg, Russia email: [email protected]
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Abstract

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The evolution of prolonged and unusually long solar cycles such as 23rd, 20th, and especially 4th is considered. Why the length of the 4th cycle was exceptionally large or really composed of two short cycles? Are the prolonged solar minima can be considered as precursor of low activity of the next cycles? Resolving these puzzles seems to be very important for dynamo theories trying to explain the solar long-term variations. We propose a possible model of the butterfly diagram during unusually long and prolonged cycles, based on (i) the Gnevyshev idea of sunspot distribution over the latitudes, and (ii) the phase differences of the northern and southern hemispheric activities.

Keywords

Sun: activitysun: magnetic fieldssun: sunspots
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 169 - 173
Copyright
Copyright © International Astronomical Union 2011

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