Propagation effects in pulsar magnetospheres

Refraction and polarization transfer in an ultrarelativistic highly magneti zed pulsar plasma are considered. Normal waves in the pulsar plasma are lin early polarized however circular polarization arises in the polarization li miting region if radiation propagates at an angle to the plane of the magne tic field lines. The rays go off this plane due to refraction or (and) due to rotation of the magnetosphere. We found significant circular polarizatio n of the outgoing radiation, in some cases with the sense reversal near the pulse centre. The frequency dependence of the circular polarization qualit atively resembles that observed. The swing of position angle of linear pola rization is studied allowing for the wave propagation in the polarization-l imiting region. The influence of refraction on the total-intensity profiles is examined as well. It is shown that refraction can provide the angular s eparation of emitted rays, so that the whole morphological classification o f pulsar profiles can be explained within the frame of the primordial hollo w-cone emission model taking into account wave propagation in the magnetosp here.