Theorem: A Static Magnetic N-pole Becomes an Oscillating Electric N-pole   in a Cosmic Axion Field
  We show for the classical Maxwell equations, including the axion electromagnetic anomaly source term, that a cosmic axion field induces an oscillating electric N-moment for any static magnetic N-moment. This is a straightforward result, accessible to anyone who has taken a first year graduate course in electrodynamics. 
Christopher T. Hill
hep-ph astro-ph.CO hep-th