Planetary Ices Attenuation Properties

McCarthy, Christine; Castillo‐Rogez, Julie

doi:10.1007/978-1-4614-3076-6_7

Cited by 26 publications

(27 citation statements)

References 142 publications

(211 reference statements)

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“…It follows that a significant temperature-induced flow viscosity gradient must exist within large ice masses, on top of other contributing factors such as crystalline fabrics, which induce mechanical anisotropy. As a result, the temperature dependence of the elastic properties of ice is of interest from static to ultrasonic frequencies, and has been explored extensively for understanding ice behaviour on icy satellites (McCarthy et al, 2008;McCarthy and Castillo-Rogez, 2013;McCarthy and Cooper, 2016).…”

Section: Temperature Dependence and Pre-meltmentioning

confidence: 99%

“…It is well understood that porosity, dislocation structures, the configuration of grain boundaries, and any crystallographic preferred orientation textures play an important role in the absolute value of visco-elastic dissipation (McCarthy and Castillo-Rogez, 2013;Cole et al, 1998) and elastic wave speeds (Maurel et al, 2015;Diez and Eisen, 2015;Gusmeroli et al, 2012) in ice.…”

Section: Temperature Dependence and Pre-meltmentioning

confidence: 99%

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Monitoring the temperature-dependent elastic and anelastic properties in isotropic polycrystalline ice using resonant ultrasound spectroscopy

et al. 2016

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Abstract. The elastic and anelastic properties of ice are of interest in the study of the dynamics of sea ice, glaciers, and ice sheets. Resonant ultrasound spectroscopy allows quantitative estimates of these properties and aids calibration of active and passive seismic data gathered in the field. The elastic properties and anelastic quality factor Q in laboratorymanufactured polycrystalline isotropic ice cores decrease (reversibly) with increasing temperature, but compressionalwave speed and attenuation prove most sensitive to temperature, indicative of pre-melting of the ice. This method of resonant ultrasound spectroscopy can be deployed in the field, for those situations where shipping samples is difficult (e.g. remote locations), or where the properties of ice change rapidly after extraction (e.g. in the case of sea ice).

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Section: Temperature Dependence and Pre-meltmentioning

confidence: 99%

Section: Temperature Dependence and Pre-meltmentioning

confidence: 99%

Monitoring the temperature-dependent elastic and anelastic properties in isotropic polycrystalline ice using resonant ultrasound spectroscopy

et al. 2016

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“…ESA's JUpiter ICy moons Explorer, JUICE, under development [25] will visit the Jupiter system in the next decades (2028) and especially Ganymede and Europa. Even the tidal theory is under an active reevaluation motivated by new laboratory experiments [67] allowing to introduce a more complex rheological response of satellites [13,27]. In addition, the tidal theory has to introduce the presence of a subsurface ocean, expected in some satellites, that could lead to increased dissipation energy [113].…”

Section: Resultsmentioning

confidence: 97%

“…However, according to laboratory measurements the frequency-dependence of the dissipation factor depends on the forcing frequency to the power α with α between 0.1 and 0.5 (see [67]). Keeping this limitation in mind, the lag is introduced by a Taylor development of d = r(t − Δt) for each frequency, that leads to…”

Section: Tidal Potentialmentioning

confidence: 99%

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Tides on Satellites of Giant Planets

Rambaux

Castillo‐Rogez

2013

Tides in Astronomy and Astrophysics

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The discovery of the satellites of the giant planets started in 1610 when Galileo Galilei pointed his telescope toward Jupiter. Since then observations from Earth-and space-based telescopes and outstanding in-situ observations by several space missions have revealed worlds of great richness and extreme diversity. One major source of energy driving the evolution of these satellites is the gravitational pull exerted by their planets. This force shapes and deforms the satellites and the resulting dissipation of mechanical energy can heat their interiors and drive spectacular activity, such as volcanic eruptions, as for Io or Enceladus. In addition, tides drive orbital evolution by circularizing the satellites' orbits and synchronizing their rotational motions.

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Self‐consistent generation of single‐plume state for Enceladus using non‐Newtonian rheology

et al. 2014

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The thermal dichotomy of Enceladus suggests an asymmetrical structure in its global heat transfer. So far, most of the models proposed that obtained such a distribution have prescribed an a priori asymmetry, i.e., some anomaly in or below the south polar ice shell. We present here the first set of numerical models of convection that yield a stable single-plume state for Enceladus without prescribed mechanical asymmetry. Using the convection code StagYY in a 2-D spherical annulus geometry, we show that a non-Newtonian ice rheology is sufficient to create a localized, single hot plume surrounded by a conductive ice mantle. We obtain a self-sustained state in which a region of small angular extent has a sufficiently low viscosity to allow subcritical to weak convection to occur due to the stress-dependent part of the rheological law. We find that the single-plume state is very unlikely to remain stable if the rheology is Newtonian, confirming what has been found by previous studies. In a second set of numerical simulations, we also investigate the first-order effect of tidal heating on the stability of the single-plume state. Tidal heating reinforces the stability of the single-plume state if it is generated in the plume itself. Lastly, we show that the likelihood of a stable single-plume state does not depend on the thickness of the ice shell.

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Planetary Ices Attenuation Properties

Cited by 26 publications

References 142 publications

Monitoring the temperature-dependent elastic and anelastic properties in isotropic polycrystalline ice using resonant ultrasound spectroscopy

Monitoring the temperature-dependent elastic and anelastic properties in isotropic polycrystalline ice using resonant ultrasound spectroscopy

Tides on Satellites of Giant Planets

Self‐consistent generation of single‐plume state for Enceladus using non‐Newtonian rheology

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