D333 降着円盤から噴出する準定常ジェット形成の散逸性磁気流体数値実験(D-33 宇宙流体(3),一般講演)

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  • D333 Resistive Magnetohydrodynamic Simulations of Formation of Quasi-steady Jets from Accretion Disks

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We carried out nonlinear global resistive magnetohydrodynamic (MHD) simulations of jet formation from an accretion disk by applying CIP-MOCCT scheme extended for resistive MHD equations. We assume axisymmetry for simplicity. The initial state is a constant angular momentum torus threaded by uniform vertical magnetic fields. After several rotation period, magnetically driven jet emanates from the surface of the disk. When the resistivity η is η～0.01r0V_<k0> where V_<k0> is the Keplerian rotation speed at unit radius r0, the system approaches a quasi-steady state. We confirmed that the integration constants which appear in steady theory of MHD jets are almost kept constant along a magnetic field line. Numerical results indicate that the disk material gradually lifted up by pressure gradient force is accelerated by magneto-centrifugal force. About half of the mechanical energy liberated by mass accretion powers the jet.

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