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We model long-term variations in the scintillation of binary pulsar PSRJ1603$-$7202, observed by the 64 m Parkes radio telescope (Murriyang) between2004 and 2016. We find that the time variation in the scintillation arccurvature is well-modelled by scattering from an anisotropic thin screen ofplasma between the Earth and the pulsar. Using our scintillation model, wemeasure the inclination angle and longitude of ascending node of the orbit,yielding a significant improvement over the constraints from pulsar timing.From our measurement of the inclination angle, we place a lower bound on themass of J1603$-$7202's companion of $\gtrsim 0.5\,\text{M}_\odot$ assuming apulsar mass of $\gtrsim1.2\,\text{M}_\odot$. We find that the scintillationarcs are most pronounced when the electron column density along the line ofsight is increased, and that arcs are present during a known extreme scatteringevent. We measure the distance to the interstellar plasma and its velocity, andwe discuss some structures seen in individual scintillation arcs within thecontext of our model.

Orbital dynamics and extreme scattering event properties from long-term scintillation observations of PSR J1603-7202