Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-locality of the Turbulent Electromotive Force   The generation of large-scale magnetic fields ($\overline{\mathbf{B}}$) in
astrophysical systems is driven by the mean turbulent electromotive force
($\overline{{\cal E}}$), the cross correlation between local fluctuations of
velocity and magnetic fields. This can depend non-locally on
$\overline{\mathbf{B}}$ through a convolution kernel $K_{ij}$. In a new
approach to find $K_{ij}$, we directly fit the time series data of
$\overline{{\cal E}}$ versus $\overline{\mathbf{B}}$ from a galactic dynamo
simulation using singular value decomposition. We calculate the usual turbulent
transport coefficients as moments of $K_{ij}$, show the importance of including
non-locality over eddy length scales to fully capture their amplitudes and that
higher order corrections to the standard transport coefficients are small in
the present case.

31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
2
The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph