Instabilities in neutron stars with toroidal magnetic fields

Understand

We study $m=1$ oscillations and instabilities of magnetised 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.