Collisionless braking of dust particles in the electrostatic field of planetary dust rings.

Details Collisionless braking of dust particles in the electrostatic field of planetary dust rings. Collisionless braking of dust particles in the electrostatic field of planetary dust rings.

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phys...45..491h&link_type=abstract

Physica Scripta, Vol. 45, No. 5, p. 491 - 496

Physics

20

Scientific paper

The authors show that a dust test particle moving in a periodic orbit in electrostatic fields, as those due to planetary rings, will experience a net deceleration also in the absence of any dust-dust collisions. The varying charge on the moving dust, as it moves in and out of regions of differing electron and ion densities, will be out of phase with the equilibrium charge in a way which leads to a net braking of the particle. This effect has been shown to damp the coherent oscillations of electrostatically supported dust rings and to damp the oscillations of levitated dust particles in plasma sheaths at surfaces of solid bodies. It is shown that this effect will lead to a damping of internal random velocities in a planetary ring, at a rate which in many cases can be much faster than that due to dust-dust collisions.

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