Magnetars after their large flare exhibit quasi-periodic oscillations as they cool. This paper looks at this modes in GR and includes the effects of the magnetic field with a realistic field geometry. They find n=0 modes with low l at frequencies of around 10-50 Hz and n=1 modes at 1 kHz. The frequencies of course depend on the properties of the underlying star --- wow!
Title: Magneto-elastic torsional oscillations of magnetars
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