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arXiv:astro-ph/9609141 (astro-ph)
[Submitted on 20 Sep 1996]

Title:The effect of Hall drift on the evolution of magnetic fields in the crusts of neutron stars

Authors:Mikael Sahrling
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Abstract: We consider the effect of Hall-drift on the evolution of magnetic fields in neutorn star crusts using a finite difference code. Previously, most studies have focused on the situation where the ohmic term dominates the evolution. Here, we investigate the case where the ohmic term is small compared to the Hall term. We show that the effect on the magnetic field energy decay rate is up to 30 % different compared to pure ohmic decay, depending on the initial conditions. In some cases the torroidal field act as an energy "reservoir" and cause a slower decay rate than the ohmic case. We also investigate the importance of high order vacuum multipoles and find that for situations where the Hall term is a couple of orders of magnitude stronger than the ohmic term, hexapoles and up are a significant part of the magnetic field at the surface of the neutron star.
Comments: 15 pages, 4 figures, all in PostScript format
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/9609141
  (or arXiv:astro-ph/9609141v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/9609141

Submission history

From: Mikael Sahrling [view email]
[v1] Fri, 20 Sep 1996 07:14:16 UTC (78 KB)
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