The evolution of spokes in Saturn's B ring

Details The evolution of spokes in Saturn's B ring The evolution of spokes in Saturn's B ring

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...54..227g&link_type=abstract

(Saturn Conference, Tucson, AZ, May 11-15, 1982) Icarus (ISSN 0019-1035), vol. 54, May 1983, p. 227-252.

Computer Science

27

Angular Velocity, Particle Density (Concentration), Planetary Structure, Saturn Rings, Spaceborne Photography, Voyager 2 Spacecraft, Brightness Distribution, High Resolution, Kinetic Energy, Optical Properties, Planetary Evolution, Planetary Rotation, Saturn, Rings, B Ring, Evolution, Spokes, Optical Properties, Imagery, Voyager 2, Classification, Characteristics, Descriptions, Comparisons, Distance, Width, Formation, Patterns

Scientific paper

Three types of Saturnian ring spoke structure have been observed which are distinguished by their optical appearance. Extended spokes are found inside the corotation radius. They are of irregular shape, with diffuse edges, but often narrowed at large distances. Their width at the base is typically 20,000 km, and their radial extent is 8000 km. The random velocity of their particles is about 2 m/s, and the total kinetic energy of their random velocity component is about 20 billion J. Narrow spokes are observed to cross the corotation distance and are characterized by high-contrast edges. Their number of particles and total energy content are about 10 percent of the values for extended spokes. Filamentary spokes are observed outside approximately 110,000 km and are usually connected to narrow or extended spokes further in. Their width is typically 500 km and their length is about 3000 km. Their number of particles and total energy content are about 0.5 percent of those of an extended spoke.

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