Statistics – Computation
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.228..513j&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 228, Sept. 15, 1987, p. 513-520.
Statistics
Computation
44
Magnetic Flux, Neutron Stars, Stellar Interiors, Stellar Magnetic Fields, Superconductors, Vortices, Boltzmann Transport Equation, Computational Astrophysics, Force Distribution, Viscous Flow
Scientific paper
The viscous force acting on a moving vortex in a proton type II superconductor has been calculated by application of Chambers' representation of the Boltzmann equation. Equilibrium between the buoyancy, Magnus and viscous forces defines a vortex drift velocity such that magnetic flux is expelled from the superconducting interior to the solid crust in less than 10 Myr, a time many orders of magnitude smaller than the previous consensus. Ohmic dissipation in the crust may then be the cause of the 5 Myr time constant seen in the decay of radio pulsar dipole moments. The longer time constant (greater than about 1000 Myr), for which some evidence exists, could be explained by a small central volume of a nonsuperconducting phase, such as a normal Fermi baryon liquid.
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