Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Alleviating alpha quenching by solar wind and meridional flow   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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The categories of this paper are: math
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: cond-mat