Flip-flop of electric potential of dust grains in space

Details Flip-flop of electric potential of dust grains in space Flip-flop of electric potential of dust grains in space

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...105...98m&link_type=abstract

Astronomy and Astrophysics, vol. 105, no. 1, Jan. 1982, p. 98-106.

Astronomy and Astrophysics

Astrophysics

113

Electric Potential, Interplanetary Dust, Interstellar Matter, Saturn Rings, Spacecraft Charging, Electron Density Profiles, Flip-Flops, Grains, Space Plasmas, Voyager 2 Spacecraft, Cosmic Dust, Grains, Electrical Properties, Charged Particles, Geometry, Plasmas, Radio Emissions, Thermal Properties, Saturn, Accretion, Flux, Dynamics, Voyager 1, Position (Location), Data, Electrons, Composition, Physical Properties, Parameters

Scientific paper

It is demonstrated that because the equilibrium equation for the charge on a cosmic dust grain may have multiple roots, when the main charging mechanisms are particle fluxes from the ambient plasma and secondary emission, the charge is not always unique. Due to the existence of two different electron energy values, giving the same secondary yield: (1) the grain's surface shoud have a high secondary emission yield if the plasma is thermal; while (2) if it is non-thermal, and not too cold, multi-valued potentials should occur frequently on nonmetallic grains. As a consequence, identical grains in the same environment but with different histories may have opposite charges, and a small change in the environment may induce large and rapid charge variations. It is conjectured that, in suitable conditions, the charge could oscillate.

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