Abstract
ABSTRACTCollisions of dust particles with magnetospheric electrons cause dust particles to become negatively charcied if the electron flux exceeds the photo-electron flux (2.5 x 1010r-2cm-2s-1) at the distance r (A.U.) from the sun. These charged dust particles interact with a planetary magnetic field via the Lorentz force. Only for very small particles (e.g. ~ .1 µm in Jupiter's magneto-sphere) the Lorentz force exceeds the gravitational force of the planet. In most observationally relevant cases (Jupiter's and Saturn's ring systems) elec-tromagnetic forces cause only small perturbations of the Keplerian orbits. Local fluctuations of the plasma parameters change the charge of the particles and lead to spatial diffusion. Small changes in the plasma environment of a ring of particulates may release large quantities of dust grains by electro-static blow-off. Drag forces induced by the magnetospheric plasma compete with the radiation pressure drag outside the synchrous orbit. Effects of these dust-magnetospheric interactions are observed in the ring systems of Jupiter and Saturn.
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