First comprehensive analysis of temporal variations in spectro-polarimetric nature of pulsars

While the temporal variation of the spectro-polarimetric nature of pulsars remains unexplored, this investigation offers significant potential for uncovering key insights into pulsar emission mechanisms, magnetic field geometry, and propagation effects within the magnetosphere.We developed a pipeline for investigating time-varying spectral behavior for all the Stokes parameters and demonstrate it on a millisecond pulsar (MSP) J2144-5237 in a binary system (orbital period 10 days) using the Parkes UWL receiver.For this MSP, our study reveals clear evidence of GHz turnover, commonly referred to as Gigahertz peaked spectrum(GPS).Additionally, we observe a strong correlation between the spectra of Stokes I, Q, and linear polarization (L), a moderate correlation between Stokes I and circular polarization (V), and no significant correlation between Stokes I and U. We also provide a Poincar sphere representation of the polarization properties of J2144-5237, demonstrating that nearby phase bins, remain clustered in the Poincar sphere, especially for high signal to noise ratio (SNR) pulsed phase bins.To our knowledge, this is the first investigation of time-varying properties of the spectro-polarimetric nature of any pulsars or MSPs.Extending this study to probe the spectro-temporal nature of full Stokes data on a larger sample of MSPs or pulsars has the potential to provide vital information on emission mechanisms inside the magnetosphere, interstellar propagation effects, and binary interactions.