Constraining Saturn’s Interior with Ring Seismology: Effects of Differential Rotation and Stable Stratification

  title={Constraining Saturn’s Interior with Ring Seismology: Effects of Differential Rotation and Stable Stratification},
  author={Janosz W. Dewberry and Christopher R. Mankovich and Jim Fuller and Dong Lai and Wenrui Xu},
  journal={The Planetary Science Journal},
Normal mode oscillations in Saturn excite density and bending waves in the C ring, providing a valuable window into the planet’s interior. Saturn’s fundamental modes (f-modes) excite the majority of the observed waves, while gravito-inertial modes (rotationally modified g-modes) associated with stable stratification in the deep interior provide a compelling explanation for additional density waves with low azimuthal wavenumbers m. However, multiplets of density waves with nearly degenerate… 

Kronoseismology. VI. Reading the Recent History of Saturn’s Gravity Field in Its Rings

Saturn’s C ring contains multiple structures that appear to be density waves driven by time-variable anomalies in the planet’s gravitational field. Semiempirical extensions of density wave theory



Cassini Ring Seismology as a Probe of Saturn’s Interior. I. Rigid Rotation

Seismology of the gas giants holds the potential to resolve long-standing questions about their internal structure and rotation state. We construct a family of Saturn interior models constrained by

Planetary Acoustic Mode Seismology: Saturn's Rings

We examine the hypothesis that the rings of Saturn may act as a seismograph, recording gravitational perturbations associated with acoustic oscillation modes of the planet. The resonant interaction

A diffuse core in Saturn revealed by ring seismology

The best constraints on the internal structures of giant planets have historically come from measurements of their gravity fields[1, 2, 31]. These gravity data are inherently mostly sensitive to a

Asymptotic theory of gravity modes in rotating stars

Context. Differential rotation has a strong influence on stellar internal dynamics and evolution, notably by triggering hydrodynamical instabilities, by interacting with the magnetic field, and more

Asymptotic expressions for the angular dependence of low‐frequency pulsation modes in rotating stars

Through the solution of Laplace's tidal equations, approximated to describe equatorially trapped wave propagation, analytical expressions are obtained for the angular dependence of pulsation modes in

Possible Evidence of p-modes in Cassini Measurements of Saturn’s Gravity Field

We analyze the range-rate residual data from Cassini’s gravity experiment that cannot be explained with a static, zonally symmetric gravity field. We reproduce the data using a simple forward model


Saturn's C ring contains multiple spiral patterns that appear to be density waves driven by periodic gravitational perturbations. In other parts of Saturn's rings, such waves are generated by

Wave propagation in semiconvective regions of giant planets

Recent observations of Jupiter and Saturn suggest that heavy elements may be diluted in the gaseous envelope, providing a compositional gradient that could stabilise ordinary convection and produce a