Alleviating alpha quenching by solar wind and meridional flow

Details Alleviating alpha quenching by solar wind and meridional flow Alleviating alpha quenching by solar wind and meridional flow

2010-08-25

arxiv.org/abs/1008.4226v2

Astron. Astrophys. 526, A138 (2011)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

consistent with the published version

Scientific paper

10.1051/0004-6361/201015637

We study the ability of magnetic helicity expulsion to alleviate catastrophic $\alpha$-quenching in mean field dynamos in two--dimensional spherical wedge domains. Motivated by the physical state of the outer regions of the Sun, we consider $\alpha^2\Omega$ mean field models with a dynamical $\alpha$ quenching. We include two mechanisms which have the potential to facilitate helicity expulsion, namely advection by a mean flow ("solar wind") and meridional circulation. We find that a wind alone can prevent catastrophic quenching, with the field saturating at finite amplitude. In certain parameter ranges, the presence of a large-scale meridional circulation can reinforce this alleviation. However, the saturated field strengths are typically below the equipartition field strength. We discuss possible mechanisms that might increase the saturated field.

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