Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre11002t&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The magnetic helicity and energy injection by a Keplerian accretion disk into its surrounding space is studied using resistive MHD. We treat the Keplerian disk as a rigid, sufficiently conducting boundary so that line-tying boundary condition adequately describes the role of disk shear rotation as the source for energy, flux, and angular momentum. The magnetic collimation in the form of helix due to external ambient plasma pressure has been demonstrated by a sequence of Grad-Shafranov equilibrium, mimicking an approximate, quasi-static evolution (Li et al. 2001, ApJ, 561, 915). Additional effects that could dynamically lead to self collimation of a force-free field are being investigated by initial value MHD simulations. Although the magnetic helicity injection rate is determined by the initial magnetic field and the disk rotation profile, the energy flux requires a global solution, which evolves in time. Motivated by the fundamental similarity to the helicity injection in laboratory fusion plasmas, we investigate the long time evolution of the disk-driven magnetic structures, especially the effects of nonlinear saturation of three dimensional kink instabilities.
Colgate Sterling A.
E. Lovelace Richard v.
Finn John M.
Li Hui
Tang Xianzhu
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