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Fig. 20

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Comparison to Tiscareno et al. (2007) and Tajeddine et al. (2017) estimates of A-ring viscosities. Left frame: symbols denote viscosities measured from damping of density waves (Tiscareno et al. 2007), while dashed lines show νD, the Daisaka et al. (2001) formula estimates (Eq. 14) assuming different internal densities of particles, ρ = 250, 450, and 900 kg m−3). In these estimates the same linear trend Σ = 337 + 13 × (a − 124) is adopted as in Tiscareno et al. (2007), where Σ is in units of kg m−2 and a in units of 1000 km. For comparison, the dash-dotted line uses a fixed Σ = 350 kg m−2 (Tiscareno & Harris 2018). Right frame: simulated total viscosities for the same models and internal densities as in Fig. 19, assuming a fixed surface density Σ = 350 kg m−3. The dashed region indicates the Tajeddine et al. (2017) viscosity estimate from angular momentum flux.

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