  We prove that a resonance enhancement of neutrino oscillations in magnetic
field is possible due to transition magnetic moments and demonstrate that this
resonance is strictly connected to the neutrino polarization. To study the main
properties of this resonance, we obtain the probabilities of transitions
between neutrino states with definite flavor and helicity in inhomogeneous
electromagnetic field in the adiabatic approximation. Since the resonance is
present only when the adiabaticity condition is fulfilled, we also obtain and
discuss this condition.
