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Can Mean Helicity Fluctuations Explain the Variability of the Solar Cycle ?

Published online by Cambridge University Press:  19 July 2016

P. Hoyng
P. Hoyng*
Affiliation:
Laboratory for Space Research Sorbonnelaan 2, 3584 AW Utrecht The Netherlands E-mail: phoyng@sron.ruu.nl

Abstract

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I consider the effect of rapid fluctuations in the mean helicity on a plane dynamo wave in the αω-approximation and in the weak forcing limit. The phase shift and the logarithmic amplitude of the wave exhibit a correlated random walk, so that weaker (stronger) cycles last longer (shorter). The solar cycle data follow this prediction rather well. Mean helicity fluctuations are concluded to be an important source of solar cycle variability.

Keywords

mean field theoryhelicity fluctuationssolar cyclerandom forcing
Type
2. Long-Term Variability of the Solar Magnetic Cycle
Information
Symposium - International Astronomical Union , Volume 157: The Cosmic Dynamo , 1993 , pp. 71 - 75
Copyright
Copyright © Kluwer 1993 

References

Allen, C.W.: 1973, Astrophysical Quantities , The Athlone Press, London Google Scholar
Barnes, J.A., Sargent, H.H. and Tryon, P.V.: 1980, in Pepin, R.O., Eddy, J.A. and Merrill, R.B., ed(s)., The Ancient Sun , Pergamon Press, New York, p. 159 Google Scholar
Braginskii, S.I.: 1965, Sov. Phys. JETP 20, 726 Google Scholar
Choudhuri, A.R.: 1992, Astron. Astrophys. 253, 277 Google Scholar
Dicke, R.H.: 1988, Solar Phys. 115, 171 Google Scholar
Hoyng, P.: 1993, Astron. Astrophys. , in press Google Scholar
Hoyng, P. and Van Geffen, J.H.G.M.: 1993, Geophys. Astrophys. Fluid Dynam. , in press Google Scholar
Moffatt, K.H.: 1978, Magnetic Field Generation in Electrically conducting Fluids , Cambridge University Press, Cambridge Google Scholar
Van Geffen, J.H.G.M.: 1993, Magnetic Energy Balance and Period Stability of the Solar Dynamo , Thesis, Univ. of Utrecht Google Scholar
Waldmeier, M.: 1935, Astr. Mitt. Zürich 14 No. 133, 105 Google Scholar