  Core and conal emission beams of radio pulsars have been identified
observationally (Rankin 1983,1993; Lyne and Manchester 1988), In the inner gap
model (Ruderman and Sutherland 1975, hereafter RS75), the gap continually
breaks down (sparking) by forming electron-positron pairs on a time scale of a
few microseconds (RS75). This makes a large amplitude low frequency wave to be
produced and which would be scattered by relativistic particles moving out from
the gap. Under this assumption, Qiao (1988a,1992) presented an Inverse Compton
Scattering (ICS) model for both core and conal emissions. This paper presented
a development of the model. Retardation and aberration effects due to different
radiation components emitted from different heights are considered. The
luminosity of pulsar radio emission via the ICS process is discussed. Coherent
emission by bunches of particles is adopted and which is adequate to explain
pulsar radiation. The theoretical results are in agreement with observations
very well.
