Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fluid Models for Kinetic Effects on Coherent Nonlinear Alfven Waves. I.
  Fundamental Theory   Collisionless regime kinetic models for coherent nonlinear Alfven wave
dynamics are studied using fluid moment equations with an approximate closure
anzatz. Resonant particle effects are modelled by incorporating an additional
term representing dissipation akin to parallel heat conduction. Unlike
collisional dissipation, parallel heat conduction is presented by an integral
operator. The modified derivative nonlinear Schrodinger equation thus has a
spatially nonlocal nonlinear term describing the long-time evolution of the
envelope of parallel-propagating Alfven waves, as well. Coefficients in the
nonlinear terms are free of the 1/(1-beta) singularity usually encountered in
previous analyses, and have very a simple form which clarifies the physical
processes governing the large amplitude Alfvenic nonlinear dynamics. The
nonlinearity appears via coupling of an Alfvenic mode to a kinetic ion-acoustic
mode. Damping of the nonlinear Alfven wave appears via strong Landau damping of
the ion-acoustic wave when the electron-to-ion temperature ratio is close to
unity. For a (slightly) obliquely propagating wave, there are finite Larmor
radius corrections in the dynamical equation. This effect depends on the angle
of wave propagation relative to B_0 and vanishes for the limit of strictly
parallel propagation. Explicit magnetic perturbation envelope equations
amenable to further analysis and numerical solution are obtained. Implications
of these models for collisionless shock dynamics are discussed.

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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol