Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Global-Scale Turbulent Convection and Magnetic Dynamo Action in the
  Solar Envelope   The operation of the solar global dynamo appears to involve many dynamical
elements. Self-consistent MHD simulations which realistically incorporate all
of these processes are not yet computationally feasible, though some elements
can now be studied with reasonable fidelity. Here we consider the manner in
which turbulent compressible convection within the bulk of the solar convection
zone can generate large-scale magnetic fields through dynamo action. We
accomplish this through a series of three-dimensional numerical simulations of
MHD convection within rotating spherical shells using our ASH code on massively
parallel supercomputers. Since differential rotation is a key ingredient in all
dynamo models, we also examine here the nature of the rotation profiles that
can be sustained within the deep convection zone as strong magnetic fields are
built and maintained. We find that the convection is able to maintain a
solar-like angular velocity profile despite the influence of Maxwell stresses
which tend to oppose Reynolds stresses and thus reduce the latitudinal angular
velocity contrast throughout the convection zone. The dynamo-generated magnetic
fields exhibit a complex structure and evolution, with radial fields
concentrated in downflow lanes and toroidal fields organized into twisted
ribbons which are extended in longitude and which achieve field strengths of up
to 5000 G. The flows and fields exhibit substantial kinetic and magnetic
helicity although systematic hemispherical patterns are only apparent in the
former. Fluctuating fields dominate the magnetic energy and account for most of
the back-reaction on the flow via Lorentz forces. Mean fields are relatively
weak and do not exhibit systematic latitudinal propagation or periodic polarity
reversals as in the sun. This may be attributed to the absence of a tachocline.

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The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: eess
1
The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol