Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43..569t&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 4, 1991, p. 569-587.
Astronomy and Astrophysics
Astronomy
8
Accretion Disks, Cosmic Plasma, Magnetohydrodynamic Flow, Pulsars, Stellar Rotation, Stellar Winds, Cold Plasmas, Interstellar Magnetic Fields, Magnetic Stars, Rotating Fluids, Stellar Gravitation
Scientific paper
Relativistic ideal MHD winds in the stationary axisymmetric magnetosphere of a rapidly rotating compact object without either gravitational or pressure effects are studied. To obtain a highly acclerated wind, it is assumed that a plasma injected from a rapid rotator should pass smoothly through both the Alfven and fast magnetosonic points, where the poloidal velocity of the plasma equals either the Alfven-wave speed or that of a fast magnetosonic wave. It is shown that an X-type fast magnetosonic point can exist at a finite distance. A super-fast MHD wind is allowed when a dense plasma starts to blow near the light surface with sufficiently large energy. The predicted asymptotic velocity of the super-fast MHD wind can exceed the velocity of 'Michel's minimum energy solution,' which is interpreted as giving the upper limit for the asymptotic flow velocity of winds.
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