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

Getling, A.V., Simitev, R. and Busse, F.H. (2006) Generation of coupled global and local magnetic fields by a cellular MHD dynamo. Proceedings of the International Astronomical Union, 2(S239), pp. 482-487. (doi:10.1017/S1743921307000944)

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Publisher's URL: http://dx.doi.org/10.1017/S1743921307000944

Abstract

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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Simitev, Dr Radostin
Authors: Getling, A.V., Simitev, R., and Busse, F.H.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Journal Name:Proceedings of the International Astronomical Union
ISSN:1743-9213
ISSN (Online):1743-9221
Published Online:21 May 2007

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