Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..569h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 569-577. Research supported by FNRS.
Astronomy and Astrophysics
Astrophysics
3
Gravity Waves, Nonuniform Plasmas, Plasma Compression, Plasma Waves, Stellar Magnetic Fields, Stellar Oscillations, A Stars, Continuous Spectra, Magnetic Field Configurations, Peculiar Stars
Scientific paper
The dynamic stabilization of unstable gravity modes by magnetic fields is investigated for nonuniform and compressible plasmas. This is done by studying the spectrum of linear motions of 1D horizontal plasmas in the presence of a horizontal sheared magnetic field and an external vertical gravity field. In case of a compressible plasma the slow subspectrum is the relevant part of the spectrum for the dynamic stabilization of unstable gravity modes. Because of the nonuniformity of the basic state this slow subspectrum consists of a discrete part and a continuous part, with the latter defined by the range of the cusp frequency. The slow subspectrum is computed for three sequences of basic states which differ by the profiles of the frequency of Brunt-Vaisala, the frequency of Alfven, and the cusp frequency. The magnetic field has a stabilizing effect and complete stability can be obtained under certain conditions for strong enough fields. The stabilizing effect of the magnetic field is determined by the variation of the cusp frequency, and, thus by the slow continuous part of the spectrum. The discrete slow subspectrum hangs on the slow continuous spectrum, so to speak, and stability can be obtained by transition of unstable regular normal modes either to stable regular modes below the slow continuum or into the slow continuum.
Goossens Marcel
Hermans D.
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