Abstract We discuss the potential (charge) on dust particles in various environments. We first consider the classical case of a single isolated dust particle. In conditions which apply to planetary dust rings, the exact value of the dust potential depends critically on several effects (e.g. secondary electron emission, photoelectric efficiency) which are not well known for small dust particles of relevant material and surface conditions. In dust clouds of high dust densities the classical approach fails to give the correct value of the dust potential due to the neglect of collective effects. In terms of an ordering parameter P = a μ N d0/n 0 (dust radius in microns × cloud dust density/exterior plasma density) the collective effects on the dust potential become apparent at P ∼ 10−6. For increasing values of P the collective effects increase, whence the dust potentials decrease and eventually approach zero.


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    Title :

    Charges on dust particles


    Contributors:
    Havnes, O. (author)

    Published in:

    Publication date :

    1984-01-01


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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