  A fluid model is developed for multicomponent two-temperature magnetized
plasmas in chemical non-equilibrium from the partially- to fully-ionized
collisional regimes. We focus on transport phenomena aiming at representing the
chromosphere of the Sun. Graille et al. [M3AS 19(04):527-599, 2009] have
derived an asymptotic fluid model for multicomponent plamas from kinetic
theory, yielding a rigorous description of the dissipative effects. The
governing equations and consistent transport properties are obtained using a
multiscale Chapman-Enskog perturbative solution to the Boltzmann equation based
on a non-dimensional analysis. The mass disparity between the electrons and
heavy particles is accounted for, as well as the influence of the
electromagnetic field. We couple this model to the Maxwell equations for the
electromagnetic field and derive the generalized Ohm's law for multicomponent
plasmas. The model inherits a well-identified mathematical structure leading to
an extended range of validity for the Sun chromosphere conditions. We compute
consistent transport properties by means of a spectral Galerkin method using
the Laguerre-Sonine polynomial approximation. Two non-vanishing polynomial
terms are used when deriving the transport systems for electrons, whereas only
one term is retained for heavy particles. In a simplified framework where the
plasma is fully ionized, we compare the transport properties for the Sun
chromosphere to conventional expressions for magnetized plasmas due to
Braginskii, showing a good agreement between both results. For more general
partially ionized conditions, representative of the Sun chromosphere, we
compute the muticomponent transport properties corresponding to the species
diffusion velocities, heavy-particle and electron heat fluxes, and viscous
stress tensor of the model, for a Helium-Hydrogen mixture in local
thermodynamic equilibrium. The model is assessed for the 3D radiative
magnetohydrodynamic simulation of a pore, in the highly turbulent upper layer
of the solar convective zone. The resistive term is found to dominate mainly
the dynamics of the electric field at the pore location. The battery term for
heavy particles appears to be higher at the pore location and at some
intergranulation boundaries.
