Electrostatic charge on a dust size distribution in a plasma

Physics

Scientific paper

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Cosmic Plasma, Electrostatic Charge, Grain Size, Interplanetary Dust, Particle Size Distribution, Poisson Equation, Gravitational Effects, Steady State, Velocity Distribution

Scientific paper

The capacitance of a grain immersed in a steady state plasma containing a size distribution of dust particles is studied. The grain charge is determined by assuming the equilibrium potential has been obtained by a simple balance of electron and ion collection currents. It is shown that the validity of the analytical treatment given here for the linearized Poisson equation is confined to a certain region of space. Within this region and starting at very small plasma Debye length lambda(D), the capacitance at first exhibits a monotonic increase with increasing lambda(D). The capacitance eventually reaches a maximum, followed by a monotonic decrease. The charge density of the dust in the plasma is found to be only a function of the lambda(D); there is no significant dependence on the interparticle spacing.

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