Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...164...77m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 164, no. 1, Aug. 1986, p. 77-85.
Astronomy and Astrophysics
Astrophysics
9
Angular Momentum, Magnetohydrodynamic Waves, Plasma Acceleration, Stellar Winds, Critical Point, Stellar Rotation, Stress Tensors, Wave Propagation
Scientific paper
The effects of finite amplitude magnetohydrodynamic fluctuations on the average background stellar wind are investigated. By a second order perturbation scheme of the steady-state conservation equations for mass, momentum and energy, the wave energy, pressure/stress tensor, and energy flux density are evaluated. It is found that MHD-waves exert an acceleration force on the ambient plasma and, if compressible, may carry a sizable angular momentum, comparable to its average value associated with the background plasma flow and magnetic field stresses. In the Bernoulli equation the waves appear through an acceleration potential which for Alfven, slow and fast magnetosonic waves can concisely be expressed as a function of the Alfvenic Mach vector, the plasma beta, and the wave propagation direction. A closed set of integrated equations of motion for a spiral magnetic field geometry is presented describing the stars overall loss of mass, angular momentum, and energy as transported away by a stellar wind in which undamped MHD-waves are embedded.
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