Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.367..375b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 367, Issue 1, pp. 375-386.
Astronomy and Astrophysics
Astronomy
31
Mhd-Galaxies: Jets
Scientific paper
The problem of the efficiency of particle acceleration for a paraboloidal poloidal magnetic field is considered within the approach of steady axisymmetric magnetohydrodynamic (MHD) flow. For the large Michel magnetization parameter σ it is possible to linearize the stream equation near the force-free solution and to solve the problem self-consistently as was done by Beskin, Kuznetsova & Rafikov for a monopole magnetic field. It is shown that, on the fast magnetosonic surface (FMS), the particle Lorentz factor γ does not exceed the standard value σ1/3. On the other hand, in the supersonic region, the Lorentz factor grows with the distance z from the equatorial plane as γ~ (z/RL)1/2 up to the distance z~σ2RL, where RL=c/ΩF is the radius of the light cylinder. Thus, the maximal Lorentz factor is γmax~σ, which corresponds to almost the full conversion of the Poynting energy flux into the particle kinetic one.
Beskin Vasilii S.
Nokhrina Elena E.
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