1996/09/20 by Mikael Sahrling, Sahrling, Mikael
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Astro and Planetary Science #Astrophysics (astro-ph) #FOS: Physical sciences #Geomagnetism and Paleomagnetism Studies #Solar and Space Plasma Dynamics #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9609141
15 pages, 4 figures, all in PostScript format
arxiv created 1996/09/20 · openalex publication_date 1996/09/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.