  Transitions in a system of neutrinos with vacuum mixing and magnetic moments,
propagating in matter and transverse magnetic field, are considered. It is
shown that in the realistic case of magnetic field direction varying along the
neutrino path qualitatively new phenomena become possible: permutation of
neutrino conversion resonances, appearance of resonances in the
neutrino-antineutrino ($\nu_{lL}\leftrightarrow\bar{\nu}_{lR}$) transition
channels, neutrino-antineutrino resonant conversion, large amplitude
$\nu_{lL}\leftrightarrow\bar{\nu}_{lR}$ oscillations, merging of different
resonances (triple resonances). Possible phenomenological implications of these
effects are briefly discussed.
