Other
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...57..422m&link_type=abstract
Icarus (ISSN 0019-1035), vol. 57, March 1984, p. 422-431.
Other
8
Saturn Rings, Space Plasmas, Constraints, Dust, Particle Charging, Particle Size Distribution, Particle Spin, Secondary Emission, Saturn, Rings, Spokes, Particles, Parameters, Emissions, Formation, Grains, Spin, Size, Electrostatic Effects, Polarization, Parent Bodies, Ejection, Oxides, Plasma, Temperature, Time Scale, Charged Particles, Calculations, Data
Scientific paper
The consequences of taking into account some physical processes previously ignored in the context of Saturn's spokes were studied. Secondary emission, which can ensure large changes of potential following small environmental variations, may provide a plausible mechanism for triggering spoke formation. Taking into account the grains' centrifugal disruption due to their spin should modify the constraints on size previously derived on the basis of electrostatic disruption alone. Taking into account the dielectric polarization when calculating the electrostatic forces on grains resting on parent bodies gives ejection conditions more stringent than previously expected. Finally, a simplified evaluation shows that if secondary emission properties of ring particles are of the order of those of many other oxides, and if the plasma temperature is near one of their threshold temperatures, then a very small environmental variation can trigger the ejection of about 0.1- to 1-micron grains from about 1-mm to 10-cm parent bodies in a very short time scale.
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