On the particle acceleration near the light surface of radio pulsars

The two–fluid effects on the radial outflow of relativistic electron–positron plasma are considered. It is shown that for large enough Michel (1969) magnetization parameter σ ≫ 1 and multiplication parameter λ = n/n GJ ≫ 1 one–fluid MHD approximation remains correct in the whole region |E| < |B|. In the case when the longitudinal electric current is smaller than the Goldreich–Julian one, the acceleration of particles near the light surface |E| = |B| is determined. It is shown that, as in the previously considered (Beskin Gurevich & Istomin 1983) cylindrical geometry, almost all electromagnetic energy is transformed into the energy of particles in the narrow boundary layer ∆̟/̟ ∼ λ −1 .