Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007mnras.377.1597m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 377, Issue 4, pp. 1597-1604.
Astronomy and Astrophysics
Astronomy
3
Magnetic Fields, Sun: Activity, Sun: Magnetic Fields, Stars: Late-Type, Stars: Magnetic Fields
Scientific paper
We consider a conventional stellar α2ω-dynamo with dynamo generators localized in two spherical shells separated by a passive layer. The signs of the α-effect as well as rotational shear in the dynamo active layers can be chosen to give dynamo waves that propagate in opposite directions (poleward and equatorward) if the layers are considered separately in the framework of the Parker migratory dynamo. In a sequence of numerical experiments we show that the variety of dynamo-generated magnetic configurations in the system under discussion is quite rich. We identify the possibility of almost independent dynamo waves existing in the two layers as well as enslavement of one layer by the other, and of activity waves generated by a joint action of the two layers. We suggest some qualitative explanations of the behaviour and discuss also the limited nature of these explanations. This variety of phenomena suggests previously underexploited freedoms to understand how predictions of dynamo theory may accommodate the observed solar and stellar activity phenomenology.
Moss David
Sokoloff Dmitry
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