  The role of magnetic fields in the multi-phase interstellar medium (ISM) is
explored using magnetohydrodynamic (MHD) simulations that include energy
injection by supernova (SN) explosions and allow for dynamo action. Apart from
providing additional pressure support of the gas layer, magnetic fields reduce
the density contrast between the warm and hot gas phases and quench galactic
outflows. A dynamo-generated, self-consistent large-scale magnetic field
affects the ISM differently from an artificially imposed, unidirectional
magnetic field.
