论文标题
由中子星形壳中的弹性力持续的磁场
Magnetic field sustained by the elastic force in neutron star crusts
论文作者
论文摘要
我们研究了中子恒星外壳和弹性力储存的磁能的磁力 - 弹性平衡。由洛伦兹力驱动的电磁运动可以由磁弹性力控制，因此磁场强度和几何形状的条件较小。对于平衡模型，磁力的次要螺线管部分通过弱弹性力平衡，因为相关部分由主要的重力和压力力平衡。因此，无论多型或环形成分如何，都可以将强磁场限制在内部。我们通过数值计算的具有最大剪切 - 固定的轴向对称模型，发现磁能$> 10^{46} $ erg也可以存储在地壳中，即使对于正常的表面偶极偶极 - 菲尔德 - 势势（$ <10^{13} $ g）。磁能超过了弹性能（$ 10^{44} -10^{45} $ erg）。剪切压力的空间分布表明，弹性结构可能会在表面附近分解。特别是，临界位置高度位于距表面小于100 m的深度。
We investigate the magneto--elastic equilibrium of a neutron star crust and magnetic energy stored by the elastic force. The solenoidal motion driven by the Lorentz force can be controlled by the magnetic elastic force, so that conditions for the magnetic field strength and geometry are less restrictive. For equilibrium models, the minor solenoidal part of the magnetic force is balanced by a weak elastic force because the irrotational part is balanced by the dominant gravity and pressure forces. Therefore, a strong magnetic field may be confined in the interior, regardless of poloidal or toroidal components. We numerically calculated axially symmetric models with the maximum shear--strain, and found that a magnetic energy $> 10^{46}$ erg can be stored in the crust, even for a normal surface dipole-field-strength ($<10^{13}$ G). The magnetic energy much exceeds the elastic energy ($ 10^{44} -10^{45}$ erg). The shear--stress spatial distribution revealed that the elastic structure is likely to break down near the surface. In particular, the critical position is highly localized at a depth less than 100 m from the surface.
