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Summary: EFFECTS OF FLOW ON RESONANT ABSORPTION OF
ALFV '
EN WAVES IN VISCOUS MHD
R '
OBERT ERD '
ELYI
Armagh Observatory,
College Hill, Armagh, BT61 9DG, N.Ireland
email: rfs@star.arm.ac.uk
December 5, 1996
Abstract. The effect of an equilibrium flow on resonant absorption of linear Alfv'en waves
in coronal loops is studied in compressible viscous MHD. The study is carried out with a
finite element code which solves the equations of viscous MHD in the whole volume of the
equilibrium model.
Computations of resonant absorption of Alfv'en waves are carried out for two classes of
models of coronal loops. We find that the efficiency of the resonant absorption process
strongly depends on both the equilibrium parameters and the characteristics of the reso
nant wave.
We show that an equilibrium shear flow can significantly influence the resonant absorption
of Alfv'en waves in coronal magnetic flux tubes. The presence of an equilibrium flow may
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