Instabilities in neutron stars with toroidal magnetic fields
Instabilities in neutron stars with toroidal magnetic fields
We study m= 1 oscillations and instabilities of magnetized neutron stars, by numerical time evolution of linear perturbations of the system. The background stars are stationary equilibrium configurations with purely toroidal magnetic fields. We find that an m= 1 instability of toroidal magnetic fields, already known from local analyses, may also be found in our relatively low-resolution global study. We present quantitative results for the instability growth rate and its suppression by rotation. The instability is discussed as a possible trigger mechanism for soft gamma repeater flares. Although our primary focus is evolutions of magnetized stars, we also consider perturbations about unmagnetized background stars in order to study m= 1 inertial modes. We track these modes up to break-up frequency ?K, extending known slow-rotation results.
instabilities, mhd, magnetic field, neutron, stars, oscillations, rotation
1394-1400
Lander, S.K.
2cad9dc5-3e37-44ed-8ffc-009e7daba257
Jones, D.I.
b8f3e32c-d537-445a-a1e4-7436f472e160
April 2010
Lander, S.K.
2cad9dc5-3e37-44ed-8ffc-009e7daba257
Jones, D.I.
b8f3e32c-d537-445a-a1e4-7436f472e160
Lander, S.K. and Jones, D.I.
(2010)
Instabilities in neutron stars with toroidal magnetic fields.
Monthly Notices of the Royal Astronomical Society, 412 (2), .
(doi:10.1111/j.1365-2966.2010.17998.x).
Abstract
We study m= 1 oscillations and instabilities of magnetized neutron stars, by numerical time evolution of linear perturbations of the system. The background stars are stationary equilibrium configurations with purely toroidal magnetic fields. We find that an m= 1 instability of toroidal magnetic fields, already known from local analyses, may also be found in our relatively low-resolution global study. We present quantitative results for the instability growth rate and its suppression by rotation. The instability is discussed as a possible trigger mechanism for soft gamma repeater flares. Although our primary focus is evolutions of magnetized stars, we also consider perturbations about unmagnetized background stars in order to study m= 1 inertial modes. We track these modes up to break-up frequency ?K, extending known slow-rotation results.
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Published date: April 2010
Keywords:
instabilities, mhd, magnetic field, neutron, stars, oscillations, rotation
Organisations:
Applied Mathematics
Identifiers
Local EPrints ID: 181537
URI: http://eprints.soton.ac.uk/id/eprint/181537
ISSN: 1365-2966
PURE UUID: e8a85f5d-f76d-4c80-8c81-26c0e5646155
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Date deposited: 18 Apr 2011 11:02
Last modified: 15 Mar 2024 03:01
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Author:
S.K. Lander
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