Abstract
Observations of magnetic fields in halos of edge‐on disk galaxies are discussed in relation to the different gaseous phases of the interstellar medium. For this comparison the presence of diffuse ionized gas (DIG) is introduced as a valuable tracer for gaseous halos which are originating from the star‐formation driven disk‐halo connection of the interstellar medium. The distribution of extraplanar DIG correlates on local and global scales with cosmic rays and magnetic fields as inferred from observations of the non‐thermal radio continuum radiation and its polarization. From the polarization a large scale and well ordered magnetic field in these gaseous halos can be deduced. These observations indicate the presence of physical processes which generate and maintain magnetic fields on galactic scales. The importance of differential rotation of the gaseous halos for such processes is briefly discussed and the possible influence of magnetic fields on the dynamics of dust particles is addressed.
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