标题： 霍尔漂移对中子星 crusts 中磁场演化的影响 显示英文标题

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

摘要： 我们利用一个有限差分法程序研究霍尔漂移对中子星地幔磁场演化的影响。此前，大多数研究集中于电导项主导演化的状况。在这里，我们研究了与霍尔项相比电导项较小的情况。我们表明，与纯电导衰减相比，磁场能量的衰减率最多可相差30%，这取决于初始条件。在某些情况下，环向场充当能量“库”，导致衰减率比电导情况更慢。我们还研究了高阶真空多极子的重要性，并发现对于霍尔项比电导项强几个数量级的情况，六极和更高阶的多极子在中子星表面占磁场的很大一部分。 显示英文摘要

摘要： 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.