ON THE 2-DIMENSIONAL STRUCTURE OF PULSAR BEAMS

This paper presents a geometrical analysis of an uniform and consisten t set of pulsar data obtained with the 100-m Effelsberg radiotelescope at 21 cm and 2.8 cm in the autumn of 199 1, during an extensive obser ving session (Pulsar Month). We have calculated the opening angles bet ween the magnetic axis and emission direction for various conal compon ents of pulsar beams. They follow two distinct lines with slopes deter mined by the inverse square root of pulsar period, supporting a result also obtained by Rankin (1993a, b). This is naturally interpreted as a double-conal organization of the mean pulsar beams.