  We numerically follow the response of density-enhanced slabs to impulsive,
localized, transverse velocity perturbations by working in the framework of
ideal magnetohydrodynamics (MHD). Both linear and nonlinear regimes are
addressed. Kink wave trains are seen to develop along the examined slabs,
sharing the characteristics that more oscillatory patterns emerge with time and
that the apparent wavelength increases with distance at a given instant. Two
features nonetheless arise due to nonlinearity, one being a density cavity
close to the exciter and the other being the appearance of shocks both outside
and inside the nominal slab. These features may be relevant for understanding
the interaction between magnetic structures and such explosive events as
coronal mass ejections. Our numerical findings on kink wave trains in solar
coronal slabs are discussed in connection with typical measurements of streamer
waves.
