Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kappa-Maxwellian electrons and Bi-Maxwellian protons in a two-fluid
  model for fast solar wind   Modeling fast solar wind based on the kinetic theory is an important task for
scientists. In this paper, we present a two-fluid model for fast solar wind
with anisotropic Kappa-Maxwellian electrons and Bi-Maxwellian protons. In the
simulation, the energy exchange between the plasma particles and low-frequency
Alfv\'en waves is considered. A set of eleven coupled equations is derived by
applying the zeroth- to fourth-order moments of the Vlasov equation and the
modified electromagnetic Maxwell equations. A characteristic of the Kappa
distribution (indicated by $\kappa$ index) is explicit in the equation for the
parallel component of the electron heat flux (parallel to the ambient magnetic
field line) and differs from the equation derived for the proton heat flux due
to the different nature of the distributions. Within the large $\kappa$ index,
the equations for the two-fluid model tend to the equations obtained by the
Maxwellian distribution. Using an iterated Crank-Nicolson method, the coupled
equations are numerically solved for the fast solar wind conditions. We show
that at (0.3 - 1) AU from the Sun, the electron density, components of
temperature, and components of heat flux follow the power-law behavior. We also
showed that near the Earth, the flow speed (electron or proton) increases with
decreasing $\kappa$. We concluded that applying the small $\kappa$ index (the
non-Maxwellian distribution), the extraordinary nature of the solar atmosphere,
with its temperature of several million kelvin temperature for electrons, has
been captured.

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The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex