RADIO-EMISSION REGIONS IN PULSARS

We study the concept of radius-to-frequency mapping using a geometrica l method for the estimation of pulsar emission altitudes. The semi-emp irical relationship proposed by Kijak gr Gil is examined over three de cades of radio frequency, It is argued that the emission region in a m illisecond pulsar occupies the magnetosphere over a distance of up to about 30 per cent of the light-cylinder radius, and that in a normal p ulsar occupies up to approximately 10 per cent of the light-cylinder r adius.