Alleviation of catastrophic quenching in solar dynamo model with nonlocal alpha-effect

Abstract

The nonlocal alpha-effect of Babcock-Leighton type is not prone to the catastrophic quenching due to conservation of magnetic helicity. This is shown with a dynamo model, which jointly applies the nonlocal alpha-effect, the diamagnetic pumping, and dynamical equation for the magnetic alpha-effect. The same model shows catastrophic quenching when the alpha-effect is changed to its local formulation. The nonlocal model shows the preferred excitation of magnetic fields of dipolar symmetry, which oscillate with a period of about ten years and have a toroidal-to-polar fields ratio of about a thousand.

6 pages, 6 figures, submitted to Astronomische Nachrichten

References in corpus (4)

• Scale dependence of alpha effect and turbulent diffusivity
• Turbulent magnetic pumping in a Babcock-Leighton solar dynamo model
• Magnetic helicity effects in astrophysical and laboratory dynamos
• Shear-driven and diffusive helicity fluxes in alpha-Omega dynamos

Cited by in corpus (11)

• Does the Babcock--Leighton Mechanism Operate on the Sun?
• Models for the long-term variations of solar activity
• Surface flux evolution constraints for flux transport dynamos
• Mean field models of flux transport dynamo and meridional circulation in the Sun and stars
• Fluctuations in the Alpha-Effect and Grand Solar Minima
• Solar Dynamo Model with Diamagnetic Pumping and Nonlocal Alpha-Effect
• Dynamo saturation through the latitudinal variation of bipolar magnetic regions in the Sun
• Turbulent processes and mean-field dynamo
• The solar dynamo: inferences from observations and modeling
• Delayed Babcock-Leighton dynamos in the diffusion-dominated regime
• Dynamical quenching with non-local alpha and downward pumping