单极感应星盘相互作用
Unipolar Induction Star-Disk Interaction
摘要：
一些关键的意见，流行的模型，星盘相互作用，特别是在旋转性质的磁场线和应用磁流体力学冻结场定理的磁盘等离子体。作为一种替代方案，单极感应模型提出，其中磁场是固定的空间和恒星单极电场$\vec E_{*}$的表面上上传到磁层。通过坡印廷矢量，恒星和磁层形成一个耦合系统，在这个耦合系统中，恒星的机械角动量、磁层的电磁角动量和磁层中等离子体的机械角动量组成的总角动量是守恒的。恒星与吸积盘的相互作用是通过单极电场$\vec E_{*}$通过等势场线投射到吸积盘上，产生盘电流，从而在盘的两侧产生符号相反的环形场，并通过恒星表面返回电流回路。其结果是，以盘电流片为边界条件，在南北半球的磁层场中加入了磁通量。这使得星盘系统成为一个天体物理学场所，通过恒星的旋转能量产生强烈的磁场。当磁层中的磁通量增加到超过磁盘的电流承载能力时，从这个星盘系统中提取角动量，导致大规模的磁爆发，将坡印廷通量以各向同性或波束的方式发送到太空。
英文摘要：
Some critical comments on the prevailing model of star-disk interaction are made, in particular, on the rotating nature of the magnetic field lines and on the application of the magnetohydrodynamic frozen-field theorem to the disk plasma. As an alternative, a unipolar induction model is proposed, where the magnetic field is stationary in space and the stellar unipolar electric field $\vec E_{*}$ on the surface is uploaded to the magnetosphere. Through the Poynting vector, the star and the magnetosphere form a coupled system where the total angular momentum, consisting the mechanical one of the star, the electromagnetic one of the magnetosphere, and the mechanical one of the plasma in the magnetosphere, is conserved. The stellar interaction with the accretion disk is through the projection of the unipolar electric field $\vec E_{*}$ onto the disk via the equipotential field lines, generating a disk current and consequently toroidal fields with opposite signs on both sides of the disk, with return current loops via the stellar surface. As a result, magnetic flux is added to the magnetospheric field in the northern and southern hemispheres with the disk current sheet as the boundary condition. This makes the star-disk system an astrophysical site where intense magnetic fields are generated through the rotational energy of the star. Angular momentum extraction from this star-disk system happens as the magnetic flux in the magnetosphere increases to the point that exceeds the current carrying capacity of the disk, leading to a mega scale magnetic eruption sending Poynting fluxes to space either isotropically or beamed.
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