Shocks and instabilities in the partially ionised solar atmosphere

A Hillier, B Snow - Advances in Space Research, 2023 - Elsevier
The low solar atmosphere is composed of mostly neutral particles, but the importance of the
magnetic field for understanding observed dynamics means that interactions between …

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 …

A comparative study of resistivity models for simulations of magnetic reconnection in the solar atmosphere

ØH Færder, D Nóbrega-Siverio, M Carlsson - Astronomy & Astrophysics, 2023 - aanda.org
Context. Magnetic reconnection is a fundamental mechanism in astrophysics. A common
challenge in mimicking this process numerically in particular for the Sun is that the solar …

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 …

Doppler-velocity drifts detected in a solar prominence

M Zapiór, P Heinzel, E Khomenko - The Astrophysical Journal, 2022 - iopscience.iop.org
We analyzed multiline observations of a quiescent prominence from the slit spectrograph
located at the Ondřejov Observatory. Dopplergrams and integrated intensity maps of the …

Tearing-mediated reconnection in magnetohydrodynamic poorly ionized plasmas. I. Onset and linear evolution

EA Tolman, MW Kunz, JM Stone… - The Astrophysical …, 2024 - iopscience.iop.org
In high-Lundquist-number plasmas, reconnection proceeds via the onset of tearing, followed
by a nonlinear phase during which plasmoids continuously form, merge, and are ejected …

Magnetic field amplification and structure formation by the Rayleigh-Taylor instability

BP Braileanu, VS Lukin, E Khomenko - Astronomy & Astrophysics, 2023 - aanda.org
We report our results from a set of high-resolution, two-fluid, non-linear simulations of the
magnetized Rayleigh Taylor instability (RTI) at the interface between a solar prominence …

Two-fluid reconnection jets in a gravitationally stratified atmosphere

BP Braileanu, R Keppens - Astronomy & Astrophysics, 2023 - aanda.org
Context. Density decreases exponentially with height in the gravitationally stratified solar
atmosphere, and therefore collisional coupling between the ionized plasma and the neutrals …

[HTML][HTML] Collisional ionization and recombination effects on coalescence instability in chromospheric partially ionized plasmas

G Murtas, A Hillier, B Snow - Physics of Plasmas, 2022 - pubs.aip.org
Plasmoid-mediated fast magnetic reconnection plays a fundamental role in driving explosive
dynamics and heating, but relatively little is known about how it develops in partially ionized …

Viscous heating and instabilities in the partially ionized solar atmosphere

BP Pandey, M Wardle - Monthly Notices of the Royal …, 2024 - academic.oup.com
In weak magnetic fields (), parallel and perpendicular viscosities, mainly from neutrals, may
exceed magnetic diffusivities (Ohm, Hall, and ambipolar) in the middle and upper …