SYNCHROTRON ABSORPTION IN PULSAR MAGNETOSPHERES

Cyclotron absorption is known to be significant in pulsar magnetospher es. It is shown that when particles absorb significant fraction of pul sar radio emission, they acquire relativistic gyration. Therefore sync hrotron absorption by relativistic plasma with small pitch-angles is c onsidered. it is shown that both the frequency of the absorbed radiati on and the absorption coefficient remain the same as in the cyclotron case provided that the angle the absorbed radiation makes with plasma velocity exceeds the pitch-angle. This condition holds if the absorbed energy is less than initial energy of plasma. Spontaneous reemission of the absorbed energy is considered. In short-period pulsars, a signi ficant fraction of the absorbed energy is reemitted in the far infrare d band.