Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...332..775p&link_type=abstract
Astronomy and Astrophysics, v.332, p.775-785 (1998)
Astronomy and Astrophysics
Astrophysics
7
Magnetohydrodynamics (Mhd), Methods: Numerical, Sun: Atmosphere, Sun: Oscillations
Scientific paper
Linear eigenmodes are determined for the solar atmosphere in the presence of a gravitational field and a magnetic field. The atmosphere consists of a horizontal nonuniform chromosphere and a semi-infinite nonuniform corona. It is bounded from below by a heavy and immovable photosphere. Inhomogeneity is confined to the vertical direction. The gravitational acceleration is constant and the equilibrium magnetic field is horizontal. The equilibrium temperature increases linearly with height in the chromosphere and is constant in the corona. The equilibrium magnetic field is constant in the chromosphere and it decreases with height in the corona in such a way that the Alfven speed is constant there. The results show that there are two sets of eigenmodes which can be viewed as p- and g-modes modified by the immobile lower boundary of the atmosphere and by the magnetic field. The modes can become damped quasi-modes with complex frequencies arising from the resonant coupling of eigenmodes to the local MHD continua in the nonuniform chromospheric layer.
Cadez Vladimir M.
Goossens Marcel
Pinter Balázs
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