Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Propagation of non-WKB Alfven waves in a multicomponent solar wind with
  differential ion flow   The propagation of dissipationless, hydromagnetic, non-WKB, purely toroidal
Alfv\'en waves in a realistic background three-fluid solar wind with axial
symmetry and differential proton-alpha flow is investigated. The wave equations
are derived from standard multi-fluid 5-moment equations. The Alfv\'enic point,
where the combined poloidal Alfv\'en Mach number $M_T=1$, is found to be a
singular point for the wave equation, which is then numerically solved for
three representative angular frequencies $\omega=10^{-3}$, $10^{-4}$ and
$10^{-5}$ rad s$^{-1}$ with a fixed wave amplitude of 10 km s$^{-1}$ imposed at
the coronal base (1 $R_\odot$). Between 1 $R_\odot$ and 1 AU, the numerical
solutions show substantial deviation from the WKB expectations. Even for the
relatively high frequency $\omega=10^{-3}$ rad s$^{-1}$, a WKB-like behavior
can be seen only in regions $r\gtrsim 10$ $R_\odot$. In the low-frequency case
$\omega=10^{-5}$ rad s$^{-1}$, the computed profiles of wave-related parameters
show a spatial dependence distinct from the WKB one, the deviation being
particularly pronounced in interplanetary space. In the inner corona $r\lesssim
4$ $R_\odot$, the computed ion velocity fluctuations are considerably smaller
than the WKB expectations in all cases, as is the computed wave-induced
acceleration exerted on protons or alpha particles. With the chosen base wave
amplitude, the wave acceleration has negligible effect on the ion force balance
in the corona. Hence processes other than the non-WKB wave acceleration are
needed to accelerate the ions out of the gravitational potential well of the
Sun. However, at large distances beyond the Alfv\'enic point, the low-frequency
waves can play an important role in the ion dynamics, with the net effect being
to equalize the speeds of the two ion species considered.

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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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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: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex