Limitation of electrostatic charging of dust particles in a plasma

Details Limitation of electrostatic charging of dust particles in a plasma Limitation of electrostatic charging of dust particles in a plasma

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..349g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, April 1984, p. 349-352.

Physics

88

Charged Particles, Electrostatic Charge, Interplanetary Dust, Plasma Currents, Saturn Rings, Traveling Charge, Electrohydrodynamics, Magnetic Disturbances, Plasma-Particle Interactions

Scientific paper

It is shown that in a dusty plasma consisting of a plasma (density n and temperature T) and dust grains (density N and radius a) the charge on a grain is not given by its free-space value. Instead, the charge is reduced by a factor 1 + x. Except for the optically thin E and G rings, this factor is large. Usually electromagnetic forces on dust particles in Saturn's ring system are too small to produce observable effects. The current carried by dust particles moving relative to the plasma with a speed w is to a good approximation given by j = NQw. Thus, magnetic perturbations by the F ring should be much smaller than previously estimated.

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