When on the institution site, please use the credentials provided by your institution. Select your institution from the list provided, which will take you to your institution's website to sign in. Click Sign in through your institution. Shibboleth / Open Athens technology is used to provide single sign-on between your institution’s website and Oxford Academic. This authentication occurs automatically, and it is not possible to sign out of an IP authenticated account.Ĭhoose this option to get remote access when outside your institution. Typically, access is provided across an institutional network to a range of IP addresses. If you are a member of an institution with an active account, you may be able to access content in one of the following ways: Get help with access Institutional accessĪccess to content on Oxford Academic is often provided through institutional subscriptions and purchases. The accreting plasma pushes them outwards and makes them parallel to the rotation axis of the disc in the meridional plane. The dipolar magnetic field lines of the central black hole is able to penetrate the plasma disc, due to the presence of a finite resistivity for the plasma. This current generates an electromagnetic field inside the disc which has both poloidal and toroidal components. 
The initially purely rotating non-magnetized plasma in the presence of an external magnetic field gives rise to an azimuthal current density and a charge density measured by the comoving observer. It has been shown that the electrical conductivity of the fluid is not constant and may be both positive and negative depending on the values of some free parameters. The radial, meridional, and time behaviours of all these quantities have been investigated. All physical quantities of the system are functions of three variables: radial distance r, polar angle θ, and time t. Magnetofluid is supposed to flow in three directions and forms a thick disc structure around the central black hole. The general relativistic phenomena, in particular, have been investigated with respect to the Ohm law. To study time-dependent phenomena of plasma surrounding a non-rotating black hole with a dipolar magnetic field, we have developed a fully set of 3 + 1 formalism of generalized general relativistic magnetohydrodynamic equations.
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