The particle acceleration in the parabolic magnetic field

Details The particle acceleration in the parabolic magnetic field The particle acceleration in the parabolic magnetic field

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..801..391b&link_type=abstract

ASTROPHYSICAL SOURCES OF HIGH ENERGY PARTICLES AND RADIATION. AIP Conference Proceedings, Volume 801, pp. 391-392 (2005).

Other

Acceleration, Magnetohydrodynamics, Magnetic Fields, Magnetohydrodynamics And Plasmas

Scientific paper

The problem of the efficiency of particle acceleration for parabolic poloidal magnetic field is considered within the approach of steady axisymmetric 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 monopole magnetic field. It is shown that on the fast magnetosonic surface 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.

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