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Wide-band radio polarization observations offer the possibility to recoverinformation about the magnetic fields in synchrotron sources, such as detailsof their three-dimensional configuration, that has previously beeninaccessible. The key physical process involved is the Faraday rotation of thepolarized emission in the source (and elsewhere along the wave's propagationpath to the observer). In order to proceed, reliable methods are required forinverting the signals observed in wavelength space into useful data in Faradayspace, with robust estimates of their uncertainty. In this paper, we examinehow variations of the intrinsic angle of polarized emission $\psi_{0}$ with theFaraday depth $\phi$ within a source affect the observable quantities. Usingsimple models for the Faraday dispersion $F(\phi)$ and $\psi_{0}(\phi)$, alongwith the current and planned properties of the main radio interferometers, wedemonstrate how degeneracies among the parameters describing the magneto-ionicmedium can be minimised by combining observations in different wavebands. Wealso discuss how depolarization by Faraday dispersion due to a random componentof the magnetic field attenuates the variations in the spectral energydistribution of the polarization and shifts its peak towards shorterwavelengths. This additional effect reduces the prospect of recovering thecharacteristics of the magnetic field helicity in magneto-ionic media dominatedby the turbulent component of the magnetic field.

Magnetic field tomography, helical magnetic fields and Faraday depolarization