EFFECT OF FLOW ON RESONANT ABSORPTION OF SLOW MHD WAVES IN CORONAL ARCADES

Resonant absorption of slow MHD waves is studied numerically by using the SGH method and is applied to a model of a coronal arcade in the pr esence of equilibrium plasma flows. The arcade is approximated by a 1D horizontal magnetic slab that is non-uniform along the Vertical direc tion and which is surrounded by two homogeneous media. While propagati ng from the photosphere upwards into the corona, the magneto-acoustic waves can be resonantly absorbed in the inhomogeneous region of the ar cade. Computational results show that the resonant absorption of the i mpinging waves strongly depends on the equilibrium model and on the ch aracteristics of the driving wave. The results also indicate that the presence of an equilibrium plasma flow along the magnetic field of the arcade reduces the resonant absorption for the flow speed parameters considered.