  We obtain the value of the mirror magnetic field during different stages of
cosmological evolution. We consider the magnetic field generation in the
radiation-dominated era and the post-recombination epoch. We also estimate its
galactic low-scale value in the process of dynamo amplification. We discuss a
possible effect of the mirror magnetic field on the mirror matter distribution
in a galaxy. The model can be generalized by assuming the existence of kinetic
mixing between ordinary and mirror particles.
