【摘要】 我们利用吸积盘中新的反常磁普朗特数来研究耗散过程对开普勒盘磁不稳定性的影响.通过分析年轻恒星周围和黑洞周围吸积盘的数值解可以得到:(1)在磁场比较小的一段阈值内,这种耗散过程是不可忽略的.(2)开普勒盘中,磁场越小,由反常粘滞及反常阻抗引起的耗散偏离理想情况就越大.(3)随着半径r的增大,耗散过程对磁不稳定性的影响也随之减小.更多还原

【Abstract】 Using the new anomalous magnetic Prandtl number in accretion disks, we study the effect of dissipation on magnetic instability of Keplerian disks. By analyzing numerically the disks around a young stellar object (YSO) and a black hole, we can obtain:(1) The dissipation can not be neglected as the magnetic field is in small threshold value.(2)In Keplerian disks, the magnetic field is smaller, the dissipation caused by anomalous viscosity and anomalous resistivity deviates from the ideal more greatly.(3) The dissipative effects on magnetic instability become smaller as the radius r becomes larger.更多还原