Astrophysics and Space Science, ( ISI ), Volume (341), No (2), Year (2012-12) , Pages (375-381)

Title : ( Viscous-resistive ADAF with a general large-scale magnetic field )

Authors: Shahram Abbassi , Amin Mosallanezhad ,

Citation: BibTeX | EndNote

Abstract

We have studied the structure of hot accretion flow bathed in a general large-scale magnetic field. We have considered magnetic parameters βr,ϕ,z[= c2 r,ϕ,z/(2c2 s )], where c2 r,ϕ,z are the Alfvén sound speeds in three direction of cylindrical coordinate (r,ϕ, z). The dominant mechanism of energy dissipation is assumed to be the magnetic diffusivity due to turbulence and viscosity in the accretion flow. Also, we adopt a more realistic model for kinematic viscosity (ν = αcsH), with both cs and H as a function of magnetic field. As a result in our model, the kinematic viscosity and magnetic diffusivity (η = η0csH) are not constant. In order to solve the integrated equations that govern the behavior of the accretion flow, a self-similar method is used. It is found that the existence of magnetic resistivity will increase the radial infall velocity as well as sound speed and vertical thickness of the disk. However the rotational velocity of the disk decreases by the increase of magnetic resistivity. Moreover, we study the effect of three components of global magnetic field on the structure of the disk

Keywords

, Accretion , Accretion disks, Magnetic field, Magnetohydrodynamics: MHD
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@article{paperid:1046496,
author = {Abbassi, Shahram and Amin Mosallanezhad},
title = {Viscous-resistive ADAF with a general large-scale magnetic field},
journal = {Astrophysics and Space Science},
year = {2012},
volume = {341},
number = {2},
month = {December},
issn = {0004-640X},
pages = {375--381},
numpages = {6},
keywords = {Accretion ، Accretion disks، Magnetic field، Magnetohydrodynamics: MHD},
}

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%0 Journal Article
%T Viscous-resistive ADAF with a general large-scale magnetic field
%A Abbassi, Shahram
%A Amin Mosallanezhad
%J Astrophysics and Space Science
%@ 0004-640X
%D 2012

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