Pulsar radio emission and bunching mechanisms

The stability of beams flowing along curved magnetic field lines, in the vicinity of the star is investigated. Two lines of research have been followed: one is a radiative electromagnetic instability which is produced by one relativistic beam streaming along a curved path. The other one is a two-stream electrostatic instability (i.e. between a positron and an electron beam). In both cases these instabilities have been mainly used as a bunching mechanism which could increase the vacuum curvature radiation. (Auth.)