Deep minima in stellar dynamos

Details Deep minima in stellar dynamos Deep minima in stellar dynamos

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...395.1013b&link_type=abstract

Astronomy and Astrophysics, v.395, p.1013-1022 (2002)

Astronomy and Astrophysics

Astrophysics

15

Magnetic Fields, Magnetohydrodynamics (Mhd), Sun: Magnetic Fields

Scientific paper

We study a Cartesian analogy for a solar dynamo model to investigate systematically a dynamo model limited by the back reaction of the Lorentz force on the differential rotation. In particular, we investigate intermittent behaviour found at low turbulent magnetic Prandtl numbers tau , and determine empirical scaling laws with tau . We find this class of models to be incapable of producing extended periods of ``normal'' behaviour separated by occasional ``grand minima'' - rather the behaviour is a mirror image, with occasional ``grand maxima''. Further we find the existence of solar-like torsional oscillations to be incompatible with low magnetic Prandtl number intermittent regimes.

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