Magnetosonic modes with a beam of dust or secondary ions

Details Magnetosonic modes with a beam of dust or secondary ions Magnetosonic modes with a beam of dust or secondary ions

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phpl...11.4589c&link_type=abstract

Physics of Plasmas, Volume 11, Issue 10, pp. 4589-4595 (2004).

Physics

1

Dusty Or Complex Plasmas, Plasma Crystals, Magnetohydrodynamic Waves, Microinstabilities, Planetary Rings

Scientific paper

Charged dust particles on near-Keplerian orbits in planetary rings drift relative to the corotating background plasma, and this relative streaming may drive dust-modified magnetosonic waves unstable. Using a magnetofluid model, this situation is revisited, and it is shown that a correct description can be obtained at frequencies and Doppler shifts that are small compared to the electron gyrofrequency. An excellent agreement is reached between the analytical approximation and the numerical solution of the full or reduced dispersion law. A very low-frequency, small wave number beam instability may occur at supermagnetosonic beam velocities of the dust component, but, based on the existing data, is unlikely to play a role in planetary rings. Instability is also found for submagnetosonic speeds, which might be relevant to Saturn's E ring.

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