Are there any stable magnetic fields in barotropic stars?

Lander, S. K. and Jones, D. I. (2012) Are there any stable magnetic fields in barotropic stars? Monthly Notices of the Royal Astronomical Society, 424 (1). pp. 482-494. ISSN 0035-8711

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Abstract

We construct barotropic stellar equilibria, containing magnetic fields with both poloidal and toroidal field components. We extend earlier results by exploring the effect of different magnetic field and current distributions. Our results suggest that the boundary treatment plays a major role in determining whether the poloidal or toroidal field component is globally dominant. Using time evolutions we provide the first stability test for mixed poloidal-toroidal fields in barotropic stars, finding that all these fields suffer instabilities due to one of the field components: these are localized around the pole for toroidal-dominated equilibria and in the closed-field line region for poloidal-dominated equilibria. Rotation provides only partial stabilization. There appears to be very limited scope for the existence of stable magnetic fields in barotropic stars. We discuss what additional physics from real stars may allow for stable fields.

Item Type:	Article
Uncontrolled Keywords:	instabilities,mhd,stars: general,stars: magnetic field,stars: neutron,astronomy and astrophysics,space and planetary science ,/dk/atira/pure/subjectarea/asjc/3100/3103
Faculty \ School:	Faculty of Science > School of Mathematics Faculty of Science > School of Physics
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	28 Jan 2020 03:52
Last Modified:	22 Oct 2022 05:45
URI:	https://ueaeprints.uea.ac.uk/id/eprint/73810
DOI:	10.1111/j.1365-2966.2012.21213.x

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