Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 735, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/735/1/L20
Keywords
magnetohydrodynamics (MHD); stars: magnetars; stars: magnetic field; stars: neutron
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [Transregio 7]
- Alexander von Humboldt Foundation
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We model the nonlinear ideal magnetohydrodynamics of poloidal magnetic fields in neutron stars in general relativity assuming a polytropic equation of state. We identify familiar hydromagnetic modes, in particular the sausage/varicose mode and kink instability inherent to poloidal magnetic fields. The evolution is dominated by the kink instability, which causes a cataclysmic reconfiguration of the magnetic field. The system subsequently evolves to new, non-axisymmetric, quasi-equilibrium end states. The existence of this branch of stable quasi-equilibria may have consequences for magnetar physics, including flare generation mechanisms and interpretations of quasi-periodic oscillations.
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