On the evolution of Saturn's 'Spokes' - Theory

Details On the evolution of Saturn's 'Spokes' - Theory On the evolution of Saturn's 'Spokes' - Theory

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...53..230m&link_type=abstract

Icarus, vol. 53, Feb. 1983, p. 230-235.

Physics

24

Electron Clouds, Interplanetary Dust, Planetary Evolution, Plasma Clouds, Saturn Rings, Debye Length, Granular Materials, Planetary Magnetic Fields, Plasma Potentials, Plasma-Particle Interactions, Solar Radiation, Spokes, Ultraviolet Radiation, Saturn, Spokes, Rings, Evolution, Theoretical Studies, Solar Radiation, Dust, Ultraviolet, Wavelengths, Electrons, Magnetic Fields, Absorption, Clouds, Hypotheses, Formation, Charged Particles

Scientific paper

Starting with the assumption that negatively charged micron-sized dust grains may be elevated above Saturn's ring plane by plasma interactions, the subsequent evolution of the system is discussed. The discharge of the fine dust by solar UV radiation produces a cloud of electrons which moves adiabatically in Saturn's dipolar magnetic field. The electron cloud is absorbed by the ring after one bounce, alters the local ring potential significantly, and reduces the local Debye length. As a result, more micron-sized dust particles may be elevated above the ring plane and the spoke grows. This process continues until the electron cloud has dissipated.

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