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Observational study of galactic magnetic fields is hampered by the fact thatthe observables only probe various projections of the magnetic fields.Comparison with numerical simulations is helpful to understand the realstructures, and observational visualization of numerical data is an importanttask. In this paper, we investigate 8~GHz radio synchrotron emission fromspiral galaxies, using the data of global three-dimensionalmagneto-hydrodynamic simulations. We assume a frequency independentdepolarization in our observational visualization. We find that the appearanceof the global magnetic field depends on the viewing angle: a face-on viewseemingly has hybrid magnetic field types combining axisymmetric modes withhiger order modes; at a viewing angle of $\sim 70\degr$, the galaxy seems tocontain a ring-like magnetic field structure; while in edge-on view, only fieldstructure parallel to the disk can be seen. The magnetic vector seen at 8~GHztraces the global magnetic field inside the disk. These results indicate thatthe topology of global magnetic field obtained from the relation betweenazimuthal angle and Faraday depth strongly depends on the viewing anglue of thegalaxy. As one of the examples, we compare our results at a viewing angle of$25\degr$ with the results of IC342. The relation between azimuthal angle andFaraday depth of the numerical result shows a tendency similar to IC342, suchas the peak numbers of the Faraday depth.

Radio broadband visualization of global three-dimensional magneto-hydrodynamical simulations of spiral galaxies I. Faraday rotation at 8GHz