Dynamo Simulations of Jupiter's Magnetic Field: The Role of Stable Stratification and a Dilute Core

Moore, K.; Barik, Ankit; Stanley, Sabine; Stevenson, D. J.; Nettelmann, Nadine; Helled, Ravit; Guillot, T.; Militzer, Burkhard; Bolton, S. J.

doi:10.1029/2022je007479

Cited by 14 publications

(12 citation statements)

References 81 publications

(167 reference statements)

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“…Furthermore, in contrast to Moore et al. (2022) our models feature multiple zonal jets, making them more gas planet‐like and allowing us to make a systematic study of jet formation and structure.…”

Section: Discussionmentioning

confidence: 76%

“…Therefore, we are able to compare the influence of varying magnetic parameters and study what factors make the zonal wind damping more efficient. Furthermore, in contrast to Moore et al (2022) our models feature multiple zonal jets, making them more gas planet-like and allowing us to make a systematic study of jet formation and structure.…”

Section: Discussionmentioning

confidence: 97%

“…Recently, Moore et al. (2022) also showed that dynamo simulations of Jupiter including a SSL at 90%–95% radius produced dynamos with a dominant axial dipole component and a similar degree of complexity as the measured Jovian magnetic field.…”

Section: Introductionmentioning

confidence: 82%

“…Gastine and Wicht (2021) conducted a global dynamo simulation with a strong radial variation of conductivity, which was successful in producing winds formed and being maintained above the highly electrically conducting region. Recently, Moore et al (2022) also showed that dynamo simulations of Jupiter including a SSL at 90%-95% radius produced dynamos with a dominant axial dipole component and a similar degree of complexity as the measured Jovian magnetic field.…”

mentioning

confidence: 80%

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The Effects of a Stably Stratified Region With Radially Varying Electrical Conductivity on the Formation of Zonal Winds on Gas Planets

Wulff,

Christensen,

Dietrich

et al. 2024

JGR Planets

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The outer areas of Jupiter and Saturn have multiple zonal winds, reaching the high latitudes, that penetrate deep into the planets' interiors, as suggested by gravity measurements. These characteristics are replicable in numerical simulations by including both a shallow stably stratified layer, below a convecting envelope, and increasing electrical conductivity. A dipolar magnetic field, assumed to be generated by a dynamo below our model, is imposed. We find that the winds' depth into the stratified layer depends on the local product of the squared magnetic field strength and electrical conductivity. The key for the drop‐off of the zonal winds is a meridional circulation which perturbs the density structure in the stable layer. In the stable region its dynamics is governed by a balance between Coriolis and electromagnetic forces. Our models suggest that a stable layer extending into weakly conducting regions could account for the observed deep zonal wind structures.

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 82%

mentioning

confidence: 80%

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The Effects of a Stably Stratified Region With Radially Varying Electrical Conductivity on the Formation of Zonal Winds on Gas Planets

Wulff,

Christensen,

Dietrich

et al. 2024

JGR Planets

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“…Z 2 is the heavy element abundance in the dilute core, which we assume to be homogeneous and convective. Together with the metallic hydrogen layer is its contribution to generating Jupiter's magnetic field (see analysis by Moore et al 2022).…”

Section: Modeling Jupiter's Interiormentioning

confidence: 99%

Study of Jupiter’s Interior with Quadratic Monte Carlo Simulations

Militzer

2023

ApJ

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We construct models for Jupiter’s interior that match the gravity data obtained by the Juno and Galileo spacecraft. To generate ensembles of models, we introduce a novel quadratic Monte Carlo technique, which is more efficient in confining fitness landscapes than the affine invariant method that relies on linear stretch moves. We compare how long it takes the ensembles of walkers in both methods to travel to the most relevant parameter region. Once there, we compare the autocorrelation time and error bars of the two methods. For a ring potential and the 2d Rosenbrock function, we find that our quadratic Monte Carlo technique is significantly more efficient. Furthermore, we modified the walk moves by adding a scaling factor. We provide the source code and examples so that this method can be applied elsewhere. Here we employ our method to generate five-layer models for Jupiter’s interior that include winds and a prominent dilute core, which allows us to match the planet’s even and odd gravity harmonics. We compare predictions from the different model ensembles and analyze how much an increase in the temperature at 1 bar and ad hoc change to the equation of state affect the inferred amount of heavy elements in the atmosphere and in the planet overall.

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Tidal Dissipation in Giant Planets

Fuller,

Guillot,

Mathis

et al. 2024

Space Sci Rev

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Tidal interactions between moons and planets can have major effects on the orbits, spins, and thermal evolution of the moons. In the Saturn system, tidal dissipation in the planet transfers angular momentum from Saturn to the moons, causing them to migrate outwards. The rate of migration is determined by the mechanism of dissipation within the planet, which is closely tied to the planet’s uncertain structure. We review current knowledge of giant planet internal structure and evolution, which has improved thanks to data from the Juno and Cassini missions. We discuss general principles of tidal dissipation, describing both equilibrium and dynamical tides, and how dissipation can occur in a solid core or a fluid envelope. Finally, we discuss the possibility of resonance locking, whereby a moon can lock into resonance with a planetary oscillation mode, producing enhanced tidal migration relative to classical theories, and possibly explaining recent measurements of moon migration rates.

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Dynamo Simulations of Jupiter's Magnetic Field: The Role of Stable Stratification and a Dilute Core

Cited by 14 publications

References 81 publications

The Effects of a Stably Stratified Region With Radially Varying Electrical Conductivity on the Formation of Zonal Winds on Gas Planets

The Effects of a Stably Stratified Region With Radially Varying Electrical Conductivity on the Formation of Zonal Winds on Gas Planets

Study of Jupiter’s Interior with Quadratic Monte Carlo Simulations

Tidal Dissipation in Giant Planets

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