Computer Science – Sound
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phpl....6..279v&link_type=abstract
Physics of Plasmas, Volume 6, Issue 1, pp. 279-284 (1999).
Computer Science
Sound
24
Impurities In Plasmas, Magnetohydrodynamics And Plasmas, Magnetohydrodynamic Waves, Sound Waves, Relativity And Gravitation, Macroinstabilities
Scientific paper
Self-gravitation could become important in dusty plasmas, due to the presence of very heavy charged dust grains, and hence could modify traditional Jeans collapse criteria known from neutral gases. Perpendicular, low-frequency magnetosonic modes can play a role in resisting gravitational collapse across the magnetic field. By treating the lighter plasma species as effectively inertialess, a unified dispersion law is obtained for Alfvén-Jeans modes, valid at all frequencies smaller than the ordinary ion gyrofrequency. Its possible relevance for interstellar space is discussed, although estimates are only indicative because of the lack of reliable data. Nevertheless, this clearly points to an important stabilizing role for the interstellar magnetic field in the perpendicular direction if all the dust is charged.
Hellberg Manfred A.
Mace Richard L.
Verheest Frank
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