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arXiv 2001.03335astro-ph.HEastro-ph.SR
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非轴对称霍尔不稳定性:理解磁星的关键

Nonaxisymmetric Hall instability: A key to understanding magnetars

Konstantinos N. Gourgouliatos, José A. Pons

摘要:

一般认为,中子星内部磁场的非线性、动力学演化在解释所观测到的现象学中起着关键作用。了解环向分量和极向分量之间或不同尺度之间的能量转移特别重要。在这封信中,我们提出了第一个三维模拟霍尔不稳定性的中子星地壳,确认其存在的典型磁星条件。我们面对我们的结果估计得到的线性扰动分析,丢弃任何解释为数值不稳定性,并确认其物理起源。有趣的是,霍尔不稳定性产生了局部的强磁结构,偶尔会使地壳屈服于磁应力,并产生日冕环,类似于太阳日冕环穿过光球层。这支持了该机制的可行性,该机制已被提议用于解释磁星爆发。

英文摘要:

It is generally accepted that the non-linear, dynamical evolution of magnetic fields in the interior of neutron stars plays a key role in the explanation of the observed phenomenology. Understanding the transfer of energy between toroidal and poloidal components, or between different scales, is of particular relevance. In this letter, we present the first 3D simulations of the Hall instability in a neutron star crust, confirming its existence for typical magnetar conditions. We confront our results to estimates obtained by a linear perturbation analysis, which discards any interpretation as numerical instabilities and confirms its physical origin. Interestingly, the Hall instability creates locally strong magnetic structures that occasionally can make the crust yield to the magnetic stresses and generates coronal loops, similarly as solar coronal loops find their way out through the photosphere. This supports the viability of the mechanism, which has been proposed to explain magnetar outbursts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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