Cycles and cycle modulations

Details Cycles and cycle modulations Cycles and cycle modulations

2011-11-14

arxiv.org/abs/1111.3351v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages, 5 figures, to appear in Proceedings of IAU Symp 286, Comparative Magnetic Minima, C. H. Mandrini, eds

Scientific paper

Some selected concepts for the solar activity cycle are briefly reviewed. Cycle modulations through a stochastic alpha effect are being identified with limited scale separation ratios. Three-dimensional turbulence simulations with helicity and shear are compared at two different scale separation ratios. In both cases the level of fluctuations shows relatively little variation with the dynamo cycle. Prospects for a shallow origin of sunspots are discussed in terms of the negative effective magnetic pressure instability. Tilt angles of bipolar active regions are discussed as a consequence of shear rather than the Coriolis force.

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