Effect of Flow on Resonant Absorption of Slow MHD Waves in Coronal Arcades |
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| Authors: | CsÍk Árpád Erdélyi Róbert Čadež Vladimir M |
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| Institution: | (1) Department of Astronomy, Eötvös University, Budapest, H-1083, Hungary;(2) Armagh Observatory, College Hill, BT61 9DG, N. Ireland;(3) Center for Plasma Astrophysics, K.U. Leuven, B-3001 Heverlee, Belgium |
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| Abstract: | 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 presence of equilibrium plasma flows. The arcade is approximated by a 1D horizontal magnetic slab that is non-uniform along the vertical direction and which is surrounded by two homogeneous media. While propagating from the photosphere upwards into the corona, the magneto-acoustic waves can be resonantly absorbed in the inhomogeneous region of the arcade. Computational results show that the resonant absorption of the impinging waves strongly depends on the equilibrium model and on the characteristics 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. |
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