Saturn's G ring: insights from the dynamical evolution of dust particles from the G-ring arc

Abstract

To explore the formation and properties of Saturn's G ring, we study the dynamics of micron-sized dust particles originating from the arc of debris near the inner edge of the ring. The dynamical evolution of particles due to various perturbation forces and the plasma sputtering that erodes the particles is simulated by a well-tested numerical code. Based on the simulation results, the normal $I/F$ of the G ring observed by the Cassini spacecraft can be explained by dust particles originating from the arc. Other properties of the G ring are also estimated, including the steady-state size distribution and the number density of ring particles, the geometric optical depth, the apparent edge-on thickness, the age and the remaining lifetime of the G ring. We find that the particle size distribution of the G ring follows a power law with an exponent of 2.8, and dust particles in the size range of $[5,10]\mu$m are dominant within the ring. The average number density of particles of the G ring in the radial direction is about $10^{-3}$-$10^{-2}{\mathrm{m}}^{-3}$. The peak value of the edge-on geometric optical depth of the G ring is about $3.9\times 10^{-2}$. The maximum apparent edge-on thickness of the G ring with the geometric optical depth larger than $1\times 10^{-8}$ is approximately $9,000\mathrm{km}$. The age of the G ring is estimated to be $10^6$-$10^7\mathrm{years}$, and the remaining lifetime of the ring is on the order of $10^4\mathrm{years}$.

References in corpus (11)

• Aegaeon (Saturn LIII), a G-ring object
• Dynamics and distribution of Jovian dust ejected from the Galilean satellites
• Seasonal and radial trends in Saturn's thermal plasma between the main rings and enceladus
• Modeling the Seasonal Variability of the Plasma Environment in Saturn's Magnetosphere between Main Rings and Mimas
• Configuration of the Martian dust rings: Shapes, densities and size-distributions from direct integrations of particle trajectories
• Dust arcs in the region of Jupiter's Trojan asteroids
• Effects of immersed moonlets in the ring arc particles of Saturn
• "Life" of dust originating from the irregular satellites of Jupiter
• Production and fate of the G ring arc particles due to Aegaeon (Saturn LIII)
• Distribution of dust ejected from the lunar surface into the Earth-Moon system
• Long-term Dynamical Evolution of Pallene (Saturn XXXIII) and its Diffuse, Dusty Ring