Ballai, I. orcid.org/0000-0002-3066-7653 (2019) Linear Waves in Partially Ionized Plasmas in Ionization Non-equilibrium. Frontiers in Astronomy and Space Sciences, 6. 39. ISSN 2296-987X
Abstract
We aim to investigate the properties of linear Alfvén and slow magnetoacoustic waves in a partially ionized plasma in ionization non-equilibrium. The propagation characteristics of these waves are studied within the framework of a two-fluid plasma in terms of the collisional strength between heavy particles for different degrees of ionization. In the ionization non-equilibrium state the rates of ionization and recombinations are not equal. For analytical progress we assume a background that is ionization equilibrium, the non-equilibrium is driven by perturbations in the system, therefore, non-equilibrium effects are related to the perturbed state of the plasma. Using simple analytical methods, we show that ionization non-equilibrium can provide an additional coupling between ions and neutrals (implicitly a secondary damping mechanism in the collisionless limit) and this process is able to keep the neutrals in the system even in the collisionless limit. Due to the coupling between different species waves become dispersive. The present study improves our understanding of the complexity of dynamical processes partially ionized plasma in the lower solar atmosphere and solar prominences. Our results clearly show that the problem of partial ionization and non-equilibrium ionization introduce new aspects of plasma dynamics with consequences on the evolution waves and their dissipation.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 Ballai. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. https://creativecommons.org/licenses/by/4.0/ |
Keywords: | partial ionization; plasma; waves and instabilities; solar chromosphere; collision; ionization; recombination |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 30 May 2019 16:02 |
Last Modified: | 30 May 2019 16:02 |
Status: | Published |
Publisher: | Frontiers Media |
Refereed: | Yes |
Identification Number: | 10.3389/fspas.2019.00039 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:146734 |