Accretion disk instability and spokes in Saturn's rings

Details Accretion disk instability and spokes in Saturn's rings Accretion disk instability and spokes in Saturn's rings

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esasp.311..261t&link_type=abstract

In ESA, Plasma Astrophysics p 261-262 (SEE N91-15046 06-90)

Astronomy and Astrophysics

Astrophysics

Accretion Disks, Astronomical Models, Magnetoacoustic Waves, Magnetohydrodynamic Stability, Mathematical Models, Saturn Rings, Spokes, Magnetic Fields, Planetary Atmospheres, Saturn (Planet), Wave Propagation

Scientific paper

The stability of accretion disks as an important problem concerning various astrophysical objects is addressed. It is shown that, in an ionized disk embedded in a vertical magnetic field, magnetohydrodynamic forces can act as a repulsive force. As a result, magnetosonic waves of low wavenumber can be amplified and produce unstable spiral modes. The amplification mechanism is shown to result from special propagation characteristics, which are explained, given to the waves by the thin disk geometry. The possibility that spokes can be due to waves, driven by a localized perturbation in Saturn's magnetosphere at a specific distance from the synchronous orbit is considered.

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