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Alleviating alpha quenching by solar wind and meridional flow
- Source :
- Astron. Astrophys. 526, A138 (2011)
- Publication Year :
- 2010
-
Abstract
- 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.<br />Comment: consistent with the published version
- Subjects :
- Astrophysics - Solar and Stellar Astrophysics
Subjects
Details
- Database :
- arXiv
- Journal :
- Astron. Astrophys. 526, A138 (2011)
- Publication Type :
- Report
- Accession number :
- edsarx.1008.4226
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1051/0004-6361/201015637