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Magnetic helicity and solar activity cycle: observations and dynamo theory

Published online by Cambridge University Press:  14 March 2005

N. Kleeorin ,
K. Kuzanyan ,
D. Moss ,
I. Rogachevskii ,
D. Sokoloff  and
H. Zhang
N. Kleeorin
Affiliation:
Department of Mechanical Engineering, Ben-Gurion University of Negev, POB 653, 84105 Beer-Sheva, Israel email: [email protected]; [email protected]
K. Kuzanyan
Affiliation:
IZMIRAN, Troitsk, Moscow Region 142190, Russia email: [email protected]
D. Moss
Affiliation:
Department of Mathematics, University of Manchester, Manchester M13 9PL, UK email: [email protected]
I. Rogachevskii
Affiliation:
Department of Mechanical Engineering, Ben-Gurion University of Negev, POB 653, 84105 Beer-Sheva, Israel email: [email protected]; [email protected]
D. Sokoloff
Affiliation:
Department of Physics, Moscow State University, Moscow 119992, Russia email: [email protected]
H. Zhang
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China email: [email protected]
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Abstract

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We study a simple model for the solar dynamo in the framework of the Parker dynamo, with a nonlinear dynamo saturation mechanism based on magnetic helicity conservation arguments. We find a parameter range in which the model demonstrates a cyclic behaviour with properties similar to that of Parker dynamo with the simplest form of algebraic $\alpha$-quenching. We compare the nonlinear current helicity evolution in this model with data for the current helicity evolution obtained during 10 years of observations at the Huairou Solar Station of China. We conclude that, in spite of the very preliminary state of the observations and the crude nature of the model, the idea of using observational data to constrain our ideas concerning magnetic field generation in the framework of the solar dynamo appears promising.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS223 , June 2004 , pp. 65 - 68
Copyright
© 2004 International Astronomical Union