  Propagation of fast-mode magnetohydrodynamic (MHD) compression waves is
traced in the Galactic Center with a poloidal magnetic cylinder. MHD waves
ejected from the nucleus are reflected and guided along the magnetic field,
exhibiting vertically stretched fronts. The radio threads and non-thermal
filaments are explained as due to tangential views of the waves driven by
sporadic activity in Sgr A$^*$, or by multiple supernovae. In the latter case,
the threads could be extremely deformed relics of old SNRs exploded in the
nucleus.
