Radial growth of an extended spoke in Saturn's B ring

Details Radial growth of an extended spoke in Saturn's B ring Radial growth of an extended spoke in Saturn's B ring

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...63..304e&link_type=abstract

Icarus (ISSN 0019-1035), vol. 63, Aug. 1985, p. 304-311.

Astronomy and Astrophysics

Astronomy

8

Astronomical Models, Planetary Orbits, Planetary Structure, Radial Distribution, Saturn Rings, Angular Velocity, Kepler Laws, Lorentz Force, Particle Charging, Particle Mass, Plasma Clouds, Saturn Atmosphere, Spokes, Voyager 2 Spacecraft, Saturn, Rings, B Ring, Spokes, Patterns, Voyager 2, Features, Orbits, Motion, Diffusion, Dynamics, Charged Particles, Calculations, Velocity, Observations, Formation, Evolution, Density

Scientific paper

The pattern of radial growth of an extended spoke recorded in the Voyager 2 low-resolution ring movie has been examined. This feature is atypical in that it orbits Saturn at the corotational rate for 1 1/2 hr after the onset of its formation and then undergoes a 40-min acceleration to sustained Keplerian velocities. The spoke exhibits two modes of radial growth: (1) a diffusion of material radially inward and outward that occurs throughout the feature's life. (2) A short-lived, rapid outward propagation of material that occurs for approximately the first 50 min of the spoke's Keplerian dynamical phase. This rapid propagation allows charge-to-mass ratios for these particulates to be calculated at the onset and the termination of the propagation, and the final dissipation of the spoke. A correlation between the dynamical phases and the radial growth modes of the atypical spoke is observed.

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