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There is theoretical and observational evidence that the jet core positionchanges with frequency. However, the core position for a given frequency mayvary with time in the case of flares or for a precessing jet. In this work, wewant to explore the changes in core position as a function of frequency,magnetic field alignment, relativistic electron density, and jet inclinationangle. We use a physical model of a synchrotron-emitting jet. Two cases of thejet are analysed, namely with magnetic field parallel and perpendicular to thejet axis. The evolution of the related spectrum is monitored over the radioband. We find that a smaller jet inclination angle or a higher electron densitycauses the jet core position to move downstream of the jet and we demonstratethat this displacement of the core along the jet gives rise to a spectralflattening.

Opacity effect on core-shift and the spectral properties of jets