Two-stream and gravitational instabilities in a grain plasma

Details Two-stream and gravitational instabilities in a grain plasma Two-stream and gravitational instabilities in a grain plasma

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992itps...20..922g&link_type=abstract

IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. 20, no. 6, p. 922-928.

Computer Science

7

Gravitational Effects, Jeans Theory, Magnetohydrodynamic Stability, Plasma Composition, Grain Size, Kinetic Theory, Particle In Cell Technique

Scientific paper

If the massive component of a two-component plasma consists of weakly charged solid grains, electrostatic and gravitational instabilities can operate on similar spatial and temporal scales. In particular, when the grain charge-to-mass ratio is of the order of the square root of the gravitational constant, the electrostatic two-stream (or Buneman) instability can seed the Jeans gravitational instability, selecting a scale for the resulting condensation. Using particle-in-cell simulations, we verify the behavior of each of these instabilities acting alone in the appropriate limits, and show that when both act in concert a grand equipartition among all available stores of energy is achieved.

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