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1 results

  • 15 - Glitches, Timing Noise, Nudot Switching
  • from Part III - Neutron Star Physics
  • Andrew Lyne, University of Manchester, Francis Graham-Smith, University of Manchester, Benjamin Stappers, University of Manchester
  • Book: Pulsar Astronomy
  • Published online: 21 July 2022
  • Print publication: 04 August 2022, pp 235-257
  • View extract

    Summary

    The characteristic steps in the rotation rates of pulsars are known as glitches and arise in the irregular transfer of angular momentum from the interior to the crust as a neutron star spins down. They are related to the structure and the fluid dynamics of some superfluid components. The angular momentum is quantised in vortices, which may be pinned to the crystal structure of the crust. Glitches may be related to catastrophic unpinning events and to cracking of the crust itself. Timing noise is quasi-random variation in rotation rate. In many pulsars, the spin-down rate is seen to switch abruptly as the emission changes, indicating that changes in magnetospheric particle flows are responsible for both spin-down and radiation.