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Generation of coupled global and local magnetic fields by a cellular MHD dynamo

Published online by Cambridge University Press:  01 August 2006

A. V. Getling ,
R. D. Simitev  and
F. H. Busse
A. V. Getling
Affiliation:
Institute of Nuclear Physics, Lomonosov Moscow State University, 119992 Moscow, Russia email: [email protected]
R. D. Simitev
Affiliation:
Department of Mathematics, University of Glasgow, G12 8QW Glasgow, UK email: [email protected]
F. H. Busse
Affiliation:
Institute of Physics, University of Bayreuth, D-95440 Bayreuth, Germany email: [email protected]
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Abstract

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The convection-driven MHD dynamo in a rotating spherical shell is simulated numerically. Convection cells are regarded as a connecting link between the global and local electromagnetic processes. Local (in many cases, bipolar) magnetic structures are regularly produced by convection cells. Dynamo regimes in “thick” and “thin” shells are discussed. In the first case, the “general” magnetic field maintained by the dynamo has a sign-alternating dipolar component, which varies cyclically, although not periodically. The local structures, as they disintegrate, change into background fields, which drift toward the poles. From time to time, reversals of the magnetic fields in the polar regions occur, as “new” background fields expel the “old” fields. In the second case, the system settles down to a nearly stationary regime without polarity reversals.

Keywords

magnetic fieldsconvectionMHD
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 482 - 487
Copyright
Copyright © International Astronomical Union 2007

References

Busse, F.H. 2004, Chaos 14, 803CrossRefGoogle Scholar
Dobler, W. & Getling, A.V. 2004, in: Stepanov, A.V., Benevolenskaya, E.E., & Kosovichev, A.G. (eds.), Multi-Wavelength Investigations of Solar Activity, Proc. IAU Symp. No. 223, St Petersburg, 14–19 June 2004 (Cambridge University Press), p. 239.Google Scholar
Getling, A.V. & Tverskoy, B.A. 1971a, Geomagn. Aeron. 11, 211Google Scholar
Getling, A.V. & Tverskoy, B.A. 1971b, Geomagn. Aeron. 11, 389Google Scholar
Getling, A.V. 2001, AZh 78, 661 (Engl. transl: Astron. Rep. 45, 569)Google Scholar
Tilgner, A. 1999 Int. J. Num. Meth. in Fluids 30, 7133.0.CO;2-Y>CrossRefGoogle Scholar
Tilgner, A. & Busse, F.H. 1997, J. Fluid Mech. 332, 359CrossRefGoogle Scholar
Tverskoy, B. A. 1966, Geomagn. Aeron. 6, 11.Google Scholar