Partially ionized plasmas in astrophysics

JL Ballester, I Alexeev, M Collados, T Downes… - Space Science …, 2018 - Springer
Partially ionized plasmas are found across the Universe in many different astrophysical
environments. They constitute an essential ingredient of the solar atmosphere, molecular …

Vortex motions in the solar atmosphere: Definitions, theory, observations, and modelling

K Tziotziou, E Scullion, S Shelyag, O Steiner… - Space Science …, 2023 - Springer
Vortex flows, related to solar convective turbulent dynamics at granular scales and their
interplay with magnetic fields within intergranular lanes, occur abundantly on the solar …

An open-source, massively parallel code for non-LTE synthesis and inversion of spectral lines and Zeeman-induced Stokes profiles

H Socas-Navarro, J de la Cruz Rodriguez… - Astronomy & …, 2015 - aanda.org
With the advent of a new generation of solar telescopes and instrumentation, interpreting
chromospheric observations (in particular, spectropolarimetry) requires new, suitable …

Alfvén wave dissipation in the solar chromosphere

SDT Grant, DB Jess, TV Zaqarashvili, C Beck… - Nature Physics, 2018 - nature.com
Magnetohydrodynamic Alfvén waves have been a focus of laboratory plasma physics and
astrophysics for over half a century. Their unique nature makes them ideal energy …

Two fluid dynamics in solar prominences

SJG Manrique, E Khomenko, M Collados… - Astronomy & …, 2024 - aanda.org
Aims. Solar prominences contain a significant number of neutral species. The dynamics of
the ionised and neutral fluids composing the prominence plasma can be slightly different if …

On the ambipolar diffusion formulation for ion-neutral drifts in the non-negligible drift velocity limit

AS Hillier - … Transactions of the Royal Society A, 2024 - royalsocietypublishing.org
The ambipolar diffusion approximation is used to model partially ionized plasma dynamics
in a single-fluid setting. To correctly apply the commonly used version of ambipolar diffusion …

Two-fluid modeling of acoustic wave propagation in gravitationally stratified isothermal media

F Zhang, S Poedts, A Lani, B Kuźma… - The Astrophysical …, 2021 - iopscience.iop.org
To study acoustic wave propagation and the corresponding energy deposition in partially
ionized plasmas, we use a two-fluid computational model that treats neutrals and charged …

Multifluid simulations of upper-chromospheric magnetic reconnection with Helium–Hydrogen mixture

QM Wargnier, J Martinez-Sykora… - The Astrophysical …, 2023 - iopscience.iop.org
Our understanding of magnetic reconnection (MR) under chromospheric conditions remains
limited. Recent observations have demonstrated the important role of ion–neutral …

Detailed description of the collision frequency in the solar atmosphere

QM Wargnier, J Martinez-Sykora… - The Astrophysical …, 2022 - iopscience.iop.org
This work aims to provide an accurate description and calculations of collision frequencies
in conditions relevant to the solar atmosphere. To do so, we focus on the detailed …

An introductory guide to fluid models with anisotropic temperatures. Part 1. CGL description and collisionless fluid hierarchy

P Hunana, A Tenerani, GP Zank… - Journal of Plasma …, 2019 - cambridge.org
We present a detailed guide to advanced collisionless fluid models that incorporate kinetic
effects into the fluid framework, and that are much closer to the collisionless kinetic …