Physics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....8910999h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Dec. 1, 1984, p. 10999-11003.
Physics
73
Charged Particles, Interplanetary Dust, Planetary Rings, Plasma Potentials, Space Plasmas, Boundary Layer Plasmas, Charge Distribution, Particle Density (Concentration), Plasma Clouds
Scientific paper
The authors have calculated the plasma potential and dust potential throughout the border region of semiinfinite dust clouds embedded in a plasma. A relevant ordering parameter is P = (NdO/NO)aμ (interior dust density/exterior plasma density)×dust radius (in microns). For comparatively high dust densities (P > 10-3) the cloud potential is high, screening out electrons, with low interior dust charges as a result. For decreasing P the cloud potential becomes less, with a corresponding increase in the dust charges. At P < 10-5 the cloud potential is practically zero and the dust particles have their maximum charge which is identical to that of a single dust particle in a plasma. For diffuse dust border regions with density scale length H very large λD (Debye length), the deviations from charge neutrality are small. When H ⪉ λD, large deviations from charge neutrality occur in the border region and also some penetration of electric fields inside the border region.
Goertz Christoph K.
Havnes Ove
Morfill Gregor E.
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