Alfven resonance in a dipole magnetosphere with moving plasma

A theoretical model of field line resonance in a magnetosphere with the dipole magnetic field and moving plasma has been constructed. It is shown that the monochromatic fast magnetosonic waves can simultaneously excite several harmonics of standing Alfvén waves on different resonant surfaces. The amplitude profile of resonant oscillations becomes asymmetric in our model in regions with a maximum gradient of the background plasma velocity (plasmapause and magnetopause), in contrast to models with stationary plasma. In these regions the phase of resonant oscillations varies non-monotonically across the resonant layer. This can be a detector of such regions when observing geomagnetic pulsations.