A search for interpulses from southern pulsars

We present the results of a search for interpulses and bridges of emission from 38 pulsars observable from the southern hemisphere. A previously undetected interpulse was found in PSR 1702–19 and observations over a wide frequency range suggests that its magnetic axis is perpendicular to its rotational axis. This information, and the emission geometry of the two other interpulse pulsars in this search suggest there is a tendency for the magnetic axis to evolve toward the rotation axis. The main pulse and interpulse of PSR 1702–19 appear to come from the centre of the polar cap region. Both emit as much as 60 per cent circular polarization; an amount rarely seen in any other pulse profile.