EMISSION OF MAGNETOSONIC WAVES BY VORTICES IN HIGH-SHEAR FLOWS

Unbounded magnetohydrodynamic flows with constant shear of velocity an d external uniform magnetic field directed perpendicular to the shear plane are considered. Vortex linear dynamics is studied by the tracing of spatial Fourier harmonics of perturbations in time. It is shown th at vortices are able to emit magnetosonic waves even in the linear reg ime. Wave emission from vortices is efficient at high shear rates and at weak or moderate external magnetic fields. (C) 1998 American Instit ute of Physics.