Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...172...85h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 172, no. 1-2, Jan. 1987, p. 85-94.
Astronomy and Astrophysics
Astrophysics
5
Gravity Waves, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Plasma Dynamics, Stellar Magnetic Fields, Stellar Oscillations, A Stars, Brunt-Vaisala Frequency, Convection, Incompressible Fluids, Plasma Slabs, Sunspots
Scientific paper
The linear spectrum of a horizontal incompressible layer in the presence of a nonuniform magnetic field is studied in order to understand the dynamic stabilization of the unstable gravity modes. Such a study is necessary to understand overstable magnetic convection. Overstable magnetoconvection has been invoked as a possible mechanism for waves and oscillations in sunspots and for rapid oscillations observed in Ap-stars. The Alfven-gravity for waves and oscillations in sunspots and for rapid oscillations observed in Ap-stars. The Alfven-gravity spectrum is computed for four sequences of equilibrium configurations that differ by the profiles of the Brunt-Vaisala frequency and the Alfven frequency, and hence by the Alfven continuum. The evolution of the spectrum is determined for increasing strength of the magnetic field.
Goossens Marcel
Hermans D.
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