Statistics – Computation
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404..185g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 1, p. 185-196.
Statistics
Computation
24
Computational Astrophysics, Galactic Structure, Gravitational Fields, Interstellar Magnetic Fields, Magnetohydrodynamic Stability, Spiral Galaxies, Binary Stars, Dynamo Theory, Magnetic Field Configurations, Perturbation Theory, Protostars
Scientific paper
The paper examines Parker's instability in a disk with a realistic vertical structure, but without including the effects of rotation and shear in the horizontal direction. In addition to the continuum modes found by previous authors for the idealized case when the vertical gravitational field is taken to be a simple step function, the possibility for discrete modes whose power is more spatially confined in z is discovered. When these discrete modes prove unstable, they favor condensations that are placed antisymmetrically with respect to the midplane, a feature found also in numerical simulations carried into the nonlinear regime by Matsumoto et al. (1988, 1990). For the continuum modes, the characteristic length scale for instability is typically half of the conventionally estimated value, yielding growth rates that are approximately double previous estimates.
Giz Ahmet T.
Shu Frank H.
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