论文标题
中子甲壳中具有大规模速度循环的磁场演化
Magnetic-field evolution with large-scale velocity circulation in a neutron-star crust
论文作者
论文摘要
我们检查磁应力超过阈值时出现的塑性流的影响。使用包含粘性流项的Navier-Stokes方程来描述所涉及的动力学，并使用准平台近似确定全局循环的速度场。 我们通过考虑大厅漂移，欧姆耗散和洛伦兹力引起的流体运动来模拟磁场演化。随着能量转换为批量运动能量和热量，磁能的减小得到了增强。已经发现，洛伦兹力诱导的散装速度对低粘度和强磁场状态具有显着影响。这种效果在磁表面附近至关重要。
We examine the effects of plastic flow that appear in a neutron-star crust when a magnetic stress exceeds the threshold. The dynamics involved are described using the Navier--Stokes equation comprising the viscous-flow term, and the velocity fields for the global circulation are determined using quasi-stationary approximation. We simulate the magnetic-field evolution by taking into consideration the Hall drift, Ohmic dissipation, and fluid motion induced by the Lorentz force. The decrease in the magnetic energy is enhanced, as the energy converts to the bulk motion energy and heat. It is found that the bulk velocity induced by the Lorentz force has a significant influence in the low-viscosity and strong-magnetic-field regimes. This effect is crucial near magnetar surfaces.
