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 a sufficiently large Michel magnetization parameter σ>>1 and multiplication parameter λnn_GJ>>1, the 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, as in the previously considered cylindrical geometry, that almost all the electromagnetic energy is transformed into the energy of particles in the narrow boundary layer Δϖϖ~λ^-1.