Vortex Creep Against Toroidal Flux Lines, Crustal Entrainment, and   Pulsar Glitches
  A region of toroidally oriented quantized flux lines must exist in the proton superconductor in the core of the neutron star. This region will be a site of vortex pinning and creep. Entrainment of the neutron superfluid with the crustal lattice leads to a requirement of superfluid moment of inertia associated with vortex creep in excess of the available crustal moment of inertia. This will effect constraints on the equation of state. The toroidal flux region provides the moment of inertia necessary to complement the crust superfluid with postglitch relaxation behavior fitting the observations. 
Erbil G\"ugercino\u{g}lu and M. Ali Alpar
astro-ph.HE