反常耗散对磁旋转不稳定性的影响  

The Effect of Anomalous Dissipation on Magnetic Rotating Instability

作　　者：周爱萍[1] 李晓卿[1] 

机构地区：[1]南京师范大学物理科学与技术学院

出　　处：《南京师大学报（自然科学版）》2003年第3期29-34,共6页Journal of Nanjing Normal University(Natural Science Edition)

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.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.

关 键 词：吸积盘 磁旋转 不稳定性 反常耗散 反常磁普朗特数 反常粘滞 反常阻抗 

分 类 号：P142[天文地球—天体物理]