Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-28
Astrophys.J.601:1031-1037,2004
Astronomy and Astrophysics
Astrophysics
18 pages, 13 figures; Accepted by ApJ
Scientific paper
10.1086/380782
Screw instability of the magnetic field connecting a rotating black hole (BH) with its surrounding disk is discussed based on the model of the coexistence of the Blandford-Znajek (BZ) process and the magnetic coupling (MC) process (CEBZMC). A criterion for the screw instability with the state of CEBZMC is derived based on the calculations of the poloidal and toroidal components of the magnetic field on the disk. It is shown by the criterion that the screw instability will occur, if the BH spin and the power-law index for the variation of the magnetic field on the disk are greater than some critical values. It turns out that the instability occurs outside some critical radii on the disk. It is argued that the state of CEBZMC always accompanies the screw instability. In addtition, we show that the screw instability contributes only a small fraction of magnetic extraction of energy from a rotating BH.
Lei Wei-Hua
Ma Ren-Yi
Wang Ding-Xiong
Yao Guo-Zheng
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