An anti-glitch in a magnetar

@article{Archibald2013AnAI,
  title={An anti-glitch in a magnetar},
  author={Robert F. Archibald and Victoria M. Kaspi and Cherry Ng and Konstantinos N. Gourgouliatos and David Tsang and Paul Scholz and Andrew P. Beardmore and Neil A. Gehrels and Jamie A. Kennea},
  journal={Nature},
  year={2013},
  volume={497},
  pages={591-593}
}
Magnetars are neutron stars with X-ray and soft γ-ray outbursts thought to be powered by intense internal magnetic fields. Like conventional neutron stars in the form of radio pulsars, magnetars exhibit ‘glitches’ during which angular momentum is believed to be transferred between the solid outer crust and the superfluid component of the inner crust. The several hundred observed glitches in radio pulsars and magnetars have involved a sudden spin-up (increase in the angular velocity) of the star… 
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