On the MHD effects on the force-free monopole outflow

Details On the MHD effects on the force-free monopole outflow On the MHD effects on the force-free monopole outflow

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.299..341b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 299, Issue 2, pp. 341-348.

Astronomy and Astrophysics

Astronomy

79

Mhd, Methods: Analytical, Stars: Neutron, Galaxies: Jets

Scientific paper

The stationary axisymmetric outflow from a rotating sphere with a (split) monopole magnetic field is considered. The stream equation describing the outflow is linearized in terms of the Michel magnetization parameter sigma^-1<<1, which allows a self-consistent analysis of the direct problem. It is shown that for a finite sigma the fast magnetosonic surface is located at a finite distance ~sigma^1/3R_L(R_L=c/Omega_F is the light cylinder). We have also found that the particle energy at the fast surface is just equal to the Michel value gamma~1/3sigma. The particle acceleration and magnetic field collimation are shown to become ineffective outside the fast magnetosonic surface.

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