  We consider two different toy cosmological models based on two fields (one
normal scalar and one phantom) realizing the same evolution of the Bang-to-Rip
type. One of the fields (pseudoscalar) interacts with the magnetic field
breaking the conformal invariance of the latter. The effects of the
amplification of cosmic magnetic fields are studied and it is shown that the
presence of such effects can discriminate between different cosmological models
realizing the same global evolution of the universe.
