论文标题
对增生磁盘的角动量传输范式的贡献
Contribution to the angular momentum transport paradigm for accretion disks
论文作者
论文摘要
我们分析了薄轴对称恒星积聚磁盘的固定构型，从而忽略了等离子体poloidal速度成分中的非线性项。我们为系统建立了毕业生 - shafranov方程，包括血浆差旋转（根据所谓的共旋转定理）。然后，我们研究磁盘向中央体磁场的小尺度反射，并计算出所得的径向插入速度。我们表明，扰动磁体表面的小规模径向振荡与相关环形电流密度的出现有关，即使在存在等离子电阻率的准理论值的情况下，也能够平衡欧姆定律。平均反应的插入速度的贡献与吸积相比，但就诱导磁场而言，与中央机构相比，它仍然可以忽略不计。
We analyze the stationary configuration of a thin axisymmetric stellar accretion disk, neglecting non-linear terms in the plasma poloidal velocity components. We set up the Grad-Shafranov equation for the system, including the plasma differential rotation (according to the so-called co-rotation theorem). Then, we study the small scale backreaction of the disk to the central body magnetic field and we calculate the resulting radial infalling velocity. We show that the small scale radial oscillation of the perturbed magnetic surface is associated to the emergence of relevant toroidal current densities, able to balance the Ohm law even in the presence of quasi-ideal values of the plasma resistivity. The contribution to the infalling velocity of the averaged backreaction contrasts accretion, but it remains negligible as far as the induced magnetic field is small compared to that of the central body.
