The Effect of aberration on polarization position angle of pulsars
  The linear polarization position angle (PPA) of pulsar emission shows a wide variety of structures, which deviates from the classical rotating vector model. In this study we investigate the effect on the PPA due to emission arising from a range of heights. We demonstrate that by appropriately choosing the emission height we can reconstruct the PPA sweep across the integrated pulse profiles. 
D. Mitra, J. H. Seiradakis