Magnetically driven jets and winds

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Accretion Disks, Euler Equations Of Motion, Magnetohydrodynamics, Plasma Jets, Plasma Waves, Astrophysics, Collimation, Critical Point, Magnetic Fields, Magnetosonic Resonance

Scientific paper

A theory for the formation and propagation of nonrelativistic jets and winds from magnetized accretion disks is derived from the equation of ideal magnetohydrodynamics. The theory allows the self consistent determination of the jet's axial velocity, radius, angular rotation rate, and temperature from the disk surface to infinity. The jets are assumed to carry no net poloidal current. However, the magnetic field is essential in that it acts, in opposition to gravity, to drive matter through the slow magnetosonic critical point. At large distances good collimation of the flow can result from the focusing effect of the external medium. Additionally, the external medium can act, in opposition to gravity, to drive the flow through the fast magnetosonic critical point.

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