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Astron. Astrophys. 339, 215-224 (1998)


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Effects of mass flow on resonant absorption and on over-reflection of magnetosonic waves in low [FORMULA] solar plasmas

Á.T. Csík *, V.M. ade and M. Goossens

Center for Plasma-Astrophysics, K.U. Leuven, Celestijnenlaan 200 B, B-3001 Heverlee, Belgium

Received 12 August 1997 / Accepted 23 June 1998

Abstract

The influence of a stationary mass flow on driven resonant MHD waves is studied for incoming slow and fast magnetosonic waves with frequencies in the slow and the Alfvén continua.

In addition to the classic resonant absorption already present in a static plasma, driven resonant waves can also undergo over-reflection. Depending on the strength of the equilibrium flow a variety of resonant MHD wave phenomena comes into existence. The resonant absorption and over-reflection are found for both, slow and fast magnetosonic waves.

The main result of this paper is that even relatively slow flows can have a drastic effect on the behaviour of MHD waves. This is in particular true under solar conditions.

Key words: MHD – plasmas – waves – Sun: atmosphere – Sun: magnetic fields

* On leave from Department of Astronomy, Eötvös University Budapest, Ludovika tér 2 H-1083 Budapest, Hungary

Send offprint requests to: Á.T. Csík

© European Southern Observatory (ESO) 1998

Online publication: September 30, 1998

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