Multi-fluid and kinetic models of partially ionized magnetic reconnection

Magnetic reconnection in partially ionized plasmas is a ubiquitous and important phenomenon in both laboratory and astrophysical systems. Here, simulations of partially ionized magnetic reconnection with well-matched initial conditions are performed using both multi-fluid and fully-kinetic approache...

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Veröffentlicht in:Physics of plasmas 2021-04, Vol.28 (4)
Hauptverfasser: Jara-Almonte, J., Murphy, N. A., Ji, H.
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Murphy, N. A.
Ji, H.
description Magnetic reconnection in partially ionized plasmas is a ubiquitous and important phenomenon in both laboratory and astrophysical systems. Here, simulations of partially ionized magnetic reconnection with well-matched initial conditions are performed using both multi-fluid and fully-kinetic approaches. Despite similar initial conditions, the time-dependent evolution differs between the two models. In multi-fluid models, the reconnection rate locally obeys either a decoupled Sweet–Parker scaling, where neutrals are unimportant, or a fully coupled Sweet–Parker scaling, where neutrals and ions are strongly coupled, depending on the resistivity. In contrast, kinetic models show a faster reconnection rate that is proportional to the fully-coupled, bulk Alfvén speed, $v^*_A$. In this work, these differences are interpreted as the result of operating in different collisional regimes. Multi-fluid simulations are found to maintain $ν_{ni}L/v^*_A$ ≳1, where $ν_{ni}$ is the neutral–ion collision frequency and L is the time-dependent current sheet half-length. This strongly couples neutrals to the reconnection outflow, while kinetic simulations evolve to allow $ν_{ni}L/v^*_A$
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subjects 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Atomic and molecular collisions
Charge exchange reactions
Collisional processes
Computational fluid dynamics
Energy equations
Magnetic reconnection
Partially ionized plasma
Particle-in-cell method
Plasma properties and parameters
Thermodynamic states and processes
title Multi-fluid and kinetic models of partially ionized magnetic reconnection
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