The distribution of mean and fluctuating magnetic fields in the   multi-phase ISM
  We explore the effects of the multi-phase structure of the interstellar medium (ISM) on galactic magnetic fields. Basing our analysis on compressible magnetohydrodynamic (MHD) simulations of supernova-driven turbulence in the ISM, we investigate the properties of both the mean and fluctuating components of the magnetic field. We find that the mean magnetic field preferentially resides in the warm phase and is generally absent from the hot phase. The fluctuating magnetic field does not show such pronounced sensitivity to the multi-phase structure. 
Cetin Can Evirgen, Frederick Armstrong Gent, Anvar Shukurov, Andrew   Fletcher, Paul Bushby
astro-ph.GA