The vast majority of pulsar profiles at meter wavelengths are dominated by core components (Rankin 1983, 1990; Lyne and Manchester 1988), but in the usual polar cap models of pulsar emission, it is difficult to get central beam or “core” radiation. In this paper, we present a calculation for both the “core” and hollow “cone” emission beams, as well as model pulse profiles in an inverse-Compton scattering (ICS) model. Both “core” and hollow “cone” emission beams axe obtained naturally in the calculations. Examples of pulse profiles of pulsars at different radio frequencies are presented.

The theoretical shapes of the pulse profiles agree very satisfactorily with actual observations, which means that the mechanism suggested here may be the actual one.