Large Scale B-Field in Stationary Accretion Disks
G.S. Bisnovatyi-Kogan, R.V.E. Lovelace
TL;DR
This paper investigates how the vertical structure of accretion disks influences the formation of strong, large-scale magnetic fields near black holes, highlighting the role of high conductivity in preventing magnetic diffusion.
Contribution
It introduces a model accounting for nonuniform vertical disk structure, showing that high conductivity in outer layers sustains strong magnetic fields near black holes.
Findings
High electrical conductivity prevents magnetic field diffusion.
A stationary state with strong magnetic fields forms near the black hole.
Vertical structure significantly impacts magnetic field configuration.
Abstract
We reconsider the problem of the formation of a large-scale magnetic field in the accretion disks around black holes. In contrast with previous work we take into account the nonuniform vertical structure of the disk. The high electrical conductivity of the outer layers of the disk prevents the outward diffusion of the magnetic field. This implies a stationary state with a strong magnetic field in the inner parts of the accretion disk close to the black hole.
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