Nonlinear Parker instability in nonuniform gravitational fields - Nonlinear oscillations and shock waves

Details Nonlinear Parker instability in nonuniform gravitational fields - Nonlinear oscillations and shock waves Nonlinear Parker instability in nonuniform gravitational fields - Nonlinear oscillations and shock waves

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356..259m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 10, 1990, p. 259-271.

Computer Science

Sound

26

Accretion Disks, Gravitational Fields, Oscillations, Shock Waves, Galactic Structure, Gas Pressure, Magnetic Field Configurations, Magnetohydrodynamic Stability

Scientific paper

The nonlinear evolution of the 'Parker' instability in accretion disks and galactic gas disks is studied by using a two-dimensional magnetohydrodynamic (MHD) code. The gas layer is assumed to be located at some distance from a point mass which is the origin of gravity. The magnetic fields are assumed to be parallel to the disk plane in magnetostatic equilibrium. The sound and Alfven speeds are taken to be spatially uniform in the initial state. The most unstable mode as well as other modes are examined in detail. It is found that nonlinear stages of the instability are generally classified into two cases: nonlinear oscillation and shock wave formation. Applications to magnetic loops in accretion disks and in galactic disks are briefly discussed.

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