The ethereal rings of Jupiter and Saturn

摘要: The brighter main band of the Jovian ring, which is tenuous and exhibits little substructure, lies in equatorial plane at 1.7-1.8 Jupiter radii, R(J); this well within Roche limit. Since dynamical evolution times survival lifetimes for micron grains are order less than 100-1000 years, visible ring must be continuously replenished. It suggested that most small generated by micrometeoroids colliding into unseen parent bodies residing band. halo composed still smaller particles radially localized about 1.3-1.7 R(J). Unlike rings Saturn Uranus, distinguished determination their form single-particle dynamics rather collective effects.