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Effective drag in rotating, poorly conducting plasma turbulence
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Benavides, Santiago J., Burns, Keaton J., Gallet, Basile and Flierl, Glenn R. (2022) Effective drag in rotating, poorly conducting plasma turbulence. The Astrophysical Journal, 938 (2). 92. doi:10.3847/1538-4357/ac9137 ISSN 1538-4357.
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WRAP-Effective-drag-in-rotating-poorly-conducting-plasma-turbulence-Benavides-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (818Kb) | Preview |
Official URL: https://doi.org/10.3847/1538-4357/ac9137
Abstract
Despite the increasing sophistication of numerical models of hot Jupiter atmospheres, the large timescale separation required in simulating the wide range in electrical conductivity between the dayside and nightside has made it difficult to run fully consistent magnetohydrodynamic (MHD) models. This has led to many studies that resort to drag parameterizations of MHD. In this study, we revisit the question of the Lorentz force as an effective drag by running a series of direct numerical simulations of a weakly rotating, poorly conducting flow in the presence of a misaligned, strong background magnetic field. We find that the drag parameterization fails once the timescale associated with the Lorentz force becomes shorter than the dynamical timescale in the system, beyond which the effective drag coefficient remains roughly constant, despite orders-of-magnitude variation in the Lorentz (magnetic) timescale. We offer an improvement to the drag parameterization by considering the relevant asymptotic limit of low conductivity and strong background magnetic field, known as the quasi-static MHD approximation of the Lorentz force. This approximation removes the fast timescale associated with magnetic diffusion, but retains a more complex version of the Lorentz force, which could be utilized in future numerical models of hot Jupiter atmospheric circulation.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics | ||||||||
| SWORD Depositor: | Library Publications Router | ||||||||
| Library of Congress Subject Headings (LCSH): | Extrasolar planets -- Atmopsheres, Astrophysics, Fluid Dynamics, Magnetohydrodynamics | ||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||
| Publisher: | The American Astronomical Society | ||||||||
| ISSN: | 1538-4357 | ||||||||
| Official Date: | 20 October 2022 | ||||||||
| Dates: |
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| Volume: | 938 | ||||||||
| Number: | 2 | ||||||||
| Number of Pages: | 8 | ||||||||
| Article Number: | 92 | ||||||||
| DOI: | 10.3847/1538-4357/ac9137 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Date of first compliant deposit: | 8 November 2022 | ||||||||
| Date of first compliant Open Access: | 8 November 2022 | ||||||||
| RIOXX Funder/Project Grant: |
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