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The Cosmic Dynamo
A b s t r a c t . Stimulated by recent high frequency radio polarization measurements of M83 and M51, we consider the influence of non-axisymmetric features (bars, spiral arms, etc...) on galactic magnetic fields. The time scale for the field amplification due to the non-axisymmetric velocity field is related to the time scale of angular momentum transport in the disk by the non-axisymmetric features. Due to its dissipational character (cooling and angular momentum transport) the gas plays adoi:10.1007/978-94-011-0772-3_72 fatcat:edamecvgmvgrli3gvfdwcfq2ie