Timing Noise analysis of HartRAO pulsars: Possible mode switching in the magnetosphere of PSR J1326-5859

Timing noise in long-term pulsar timing residuals is challenging our understanding of the present pulsar model and forms part of several key science projects, including the detection of GWs and the development of next-generation instruments for pulsar astronomy. We investigate the timing noise phenomena in PSR J1326-5859 that was observed with the 26m HartRAO radio telescope for several decades. One explanation for timing noise is mode switching in the magnetosphere of the pulsar. In this paper we investigate the possible mode switching seen in the spin-down evolution and the pulse shape parameters of PSR J1326-5859. We also search for possible correlations between the parameter data sets.