Absence of Average Polarization at 111·5 MHz in Pulsar NP 0532

Abstract

THE average polarization properties of NP 0532 have been measured at about 400 MHz by us1, by Manchester (private communication) and by Schonhardt2. Strong linear polarization is present in the precursor while the other pulse components are only weakly linearly polarized and the position angle is independent of pulse phase. The polarization properties of strong single pulses have been measured at high frequency by ourselves3,4 and at lower frequencies by Staelin and Sutton5, who have shown that large linear polarization does not occur in strong pulses. We have now measured the four Stokes parameters of the average pulse at 111·5 MHz.