Multifluid modeling of magnetosonic wave propagation in the solar chromosphere -- effects of impact ionization and radiative recombination

Abstract

In order to study chromospheric magnetosonic wave propagation including, for the first time, the effects of ion-neutral interactions in the partially ionized solar chromosphere, we have developed a new multi-fluid computational model, accounting for ionization and recombination reactions in gravitationally stratified magnetized collisional media. The two-fluid model used in our 2D numerical simulations treats neutrals as a separate fluid and considers charged species (electrons and ions) within the resistive MHD approach with Coulomb collisions and anisotropic heat flux determined by Braginskii's transport coefficients. The electromagnetic fields are evolved according to the full Maxwell equations and the solenoidality of the magnetic field is enforced with a hyperbolic divergence cleaning scheme. The initial density and temperature profiles are similar to VAL III chromospheric model in which dynamical, thermal and chemical equilibrium are considered to ensure comparison to existing MHD models and avoid artificial numerical heating. In this initial setup we include simple homogeneous flux tube magnetic field configuration and an external photospheric velocity driver to simulate the propagation of MHD waves in the partially ionized reactive chromosphere. In particular, we investigate the loss of chemical equilibrium and the plasma heating related to the steepening of fast magnetosonic wave fronts in the gravitationally stratified medium.

39 pages, 13 figures

References in corpus (6)

• Dynamic Fibrils are driven by Magnetoacoustic Shocks
• On the prevalence of small-scale twist in the solar chromosphere and transition region
• Non-linear numerical simulations of magneto-acoustic wave propagation in small-scale flux tubes
• Rayleigh-Taylor instability in prominences from numerical simulations including partial ionization effects
• Overdamped Alfven waves due to ion-neutral collisions in the solar chromosphere
• Viscosity effects on waves in partially and fully ionized plasma in magnetic field

Cited by in corpus (11)

• COCONUT, a novel fast-converging MHD model for solar corona simulations: I. Benchmarking and optimization of polytropic solutions
• COCONUT, a novel fast-converging MHD model for solar corona simulations: II. Assessing the impact of the input magnetic map on space-weather forecasting at minimum of activity
• Two-fluid Modeling of Acoustic Wave Propagation in Gravitationally Stratified Isothermal Media
• Heating of a Quiet Region of the Solar Chromosphere by Ion and Neutral Acoustic Waves
• Waves in weakly ionised solar plasmas
• Two-fluid numerical model of chromospheric heating and plasma outflows in a quiet-Sun
• Chromospheric heating and generation of plasma outflows by impulsively generated two-fluid magnetoacoustic waves
• Fast magneto-acoustic waves in the solar chromosphere: Comparison of single-fluid and two-fluid approximations
• Alfvén wave propagation in the partially ionized lower solar atmosphere: a test of the single-fluid approximation
• Numerical Simulations of Two-Fluid Magnetoacoustic Waves in the Solar Atmosphere
• MHD waves in the partially ionized plasma: from single to multi-fluid approach