Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..423t&link_type=abstract
Geophysical Research Letters, vol. 9, Apr. 1982, p. 423-426.
Physics
18
Charged Particles, Electric Potential, Planetary Structure, Saturn Rings, Angular Velocity, Kepler Laws, Particle Size Distribution, Planetary Rotation, Saturn, Spokes, Particles, Rings, Velocity, Features, Observations, Electrostatic Effects, Ejecta, Parent Bodies, Size, Emissions, Data, Composition, Charged Particles, Motion, Radii, Hypotheses
Scientific paper
It is noted that an observed deviation of the angular velocity of spoke features from the Keplerian value can yield the charge to mass (q/m) ratio of spoke particles. Observations in the literature of spoke motion are consistent with q/m in the neighborhood of -10 coul/kg. Since a lower limit on q is one electronic charge, this value yields a lower limit to the size of spoke particles of approximately 0.01 micron. The criteria for electrostatically ejecting small particles from larger parent bodies suggest an upper limit of approximately 1,000 m for the parent bodies. The stability of the grains to electrostatic disruption or field emission yields an upper limit of approximately 3 microns for the spoke particle size. It also leads to the conclusion that the spoke particles must consist of material that is stronger than loose dust balls.
Goertz Christoph K.
Hill Richard J.
Northrop Theodore G.
Thomsen Michelle F.
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