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Astron. Astrophys. 346, 295-302 (1999)

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The Gleissberg cycle by a nonlinear [FORMULA][FORMULA] dynamo

V.V. Pipin

Institute for Solar-Terrestrial Physics, Irkutsk, Russia (pip@iszf.irk.ru)

Received 21 September 1998 / Accepted 15 March 1999


This paper suggests a numerical model of the Gleissberg cycle based on a spherical shell dynamo. The formulation of the problem includes a description both of the rotation law and of the hydromagnetic dynamo. The suggested model allows the Gleissberg cycle to be interpreted as resulting from the magnetic feedback on the angular momentum fluxes which maintain the rotation law in the shell. The period of the long-term variations is determined by relaxation properties of the shell. Hence, it is directly associated with the time taken to re-establish the differential rotation after the magnetic perturbations of the angular momentum transport.

Key words: Magnetohydrodynamics (MHD) – turbulence – Sun: activity – Sun: magnetic fields – Sun: rotation

This article contains no SIMBAD objects.


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© European Southern Observatory (ESO) 1999

Online publication: May 6, 1999