Journal
ASTROPHYSICAL JOURNAL
Volume 741, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/741/1/1
Keywords
dynamo; magnetohydrodynamics (MHD); Sun: dynamo
Categories
Funding
- NASA [LWS NNX09AJ85G]
- RFBR [10-02-00148-a]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0908185, 908566] Funding Source: National Science Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1063439, 0752135] Funding Source: National Science Foundation
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The paper presents a study of a solar dynamo model operating in the bulk of the convection zone with the toroidal magnetic field flux concentrated in the subsurface rotational shear layer. We explore how this type of dynamo may depend on spatial variations of turbulent parameters and on the differential rotation near the surface. The mean-field dynamo model takes into account the evolution of magnetic helicity and describes its nonlinear feedback on the generation of large-scale magnetic field by the alpha-effect. We compare the magnetic cycle characteristics predicted by the model, including the cycle asymmetry (associated with the growth and decay times) and the duration-amplitude relation (Waldmeier's effects), with the observed sunspot cycle properties. We show that the model qualitatively reproduces the basic properties of the solar cycles.
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