标题： 磁力耦合吸积盘内的能量耗散与角动量转移 显示英文标题

标题： Energy dissipation and angular momentum transfer within a magnetically torqued accretion disc

摘要： 我们讨论磁连接（MC）过程和Blandford-Payne（BP）过程中能量和角动量的运输和重新分布。 MC导致内部粘滞力矩的重新调整，其影响不仅在MC区域内部起作用，而且超出MC区域。 BP过程被用来将吸积盘中的“过量”角动量转移出去。 此外，我们推导出一个内部粘滞力矩的标准，以解决吸积盘中角动量整体平衡的谜题。 结果表明，提取角动量的BP效率和外流强度必须大于某些临界值。 显示英文摘要

摘要： We discuss transportation and redistribution of energy and angular momentum in the magnetic connection (MC) process and Blandford-Payne (BP) process. The MC results in readjusting the interior viscous torque, and its effects are operative not only in but also beyond the MC region. The BP process is invoked to transfer the "excessive" angular momentum from an accretion disc. In addition, we derive a criterion for the interior viscous torque to resolve the puzzle of the overall equilibrium of angular momentum in disc accretion. It turns out that the BP efficiency of extracting angular momentum and the intensity of the outflow are required to be greater than some critical values.