Oscillatory Reconnection of a 2D X-point in a hot coronal plasma

Karampelas, Konstantinos, McLaughlin, James, Botha, Gert and Regnier, Stephane (2022) Oscillatory Reconnection of a 2D X-point in a hot coronal plasma. The Astrophysical Journal, 925 (2). p. 195. ISSN 0004-637X

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Official URL: https://doi.org/10.3847/1538-4357/ac3b53


Oscillatory reconnection (a relaxation mechanism with periodic changes in connectivity) has been proposed as a potential physical mechanism underpinning several periodic phenomena in the solar atmosphere including, but not limited to, quasi-periodic pulsations (QPPs). Despite its importance, however, the mechanism has never been studied within a hot, coronal plasma. We investigate oscillatory reconnection in a one million Kelvin plasma by solving the fully-compressive, resistive MHD equations for a 2D magnetic X-point under coronal conditions using the PLUTO code. We report on the resulting oscillatory reconnection including its periodicity and decay rate. We observe a more complicated oscillating profile for the current density compared to that found for a cold plasma, due to mode-conversion at the equipartition layer. We also consider, for the first time, the effect of adding anisotropic thermal conduction to the oscillatory reconnection mechanism, and we find this simplifies the spectrum of the oscillation profile and increases the decay rate. Crucially, the addition of thermal conduction does not prevent the oscillatory reconnection mechanism from manifesting. Finally, we reveal a relationship between the equilibrium magnetic field strength, decay rate, and period of oscillatory reconnection, which opens the tantalising possibility of utilizing oscillatory reconnection as a seismological tool.

Item Type: Article
Additional Information: Funding information: All authors acknowledge UK Science and Technology Facilities Council (STFC) support from grant ST/T000384/1. K.K. also acknowledges support by an FWO (Fonds voor Wetenschappelijk Onderzoek – Vlaanderen) postdoctoral fellowship (1273221N). This work used the Oswald High Performance Computing facility operated by Northumbria University (UK).
Uncontrolled Keywords: Magnetohydrodynamics, Solar magnetic reconnection, Solar coronal seismology, Solar coronal waves, Magnetohydrodynamical simulations
Subjects: F300 Physics
F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
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Depositing User: Elena Carlaw
Date Deposited: 16 Dec 2021 13:29
Last Modified: 09 Feb 2022 10:30
URI: http://nrl.northumbria.ac.uk/id/eprint/47995

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