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| Titel |
Tidal Dissipation Within the Jupiter Moon Io – A Numerical Approach |
| VerfasserIn |
Teresa Steinke, Wouter van der Wal, Haiyang Hu, Bert Vermeersen |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250145403
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| Publikation (Nr.) |
 EGU/EGU2017-9341.pdf |
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| Zusammenfassung |
| Satellite images and recent Earth-based observations of the innermost of the Galilean moons
reveal a conspicuous pattern of volcanic hotspots and paterae on its surface. This pattern is
associated with the heat flux originating from tidal dissipation in Io’s mantle and
asthenosphere. As shown by many analytical studies [e.g. Segatz et al. 1988], the local heat
flux pattern depends on the rheology and structure of the satellite’s interior and therefore
could reveal constraints on Io’s present interior. However, non-linear processes, different
rheologies, and in particular lateral variations arising from the spatial heating pattern are
difficult to incorporate in analytical 1D models but might be crucial. This motivates the
development of a 3D finite element model of a layered body disturbed by a tidal
potential.
As a first step of this project we present a 3D finite element model of a spherically
stratified body of linear viscoelastic rheology. For validation, we compare the resulting tidal
deformation and local heating patterns with the results obtained by analytical models.
Numerical errors increase with lower values of the asthenosphere viscosity. Currently,
the numerical model allows realistic simulation down to viscosities of 1018 Pa s.
Furthermore, we investigate an adequate way to deal with the relaxation of false
modes that arise at the onset of the periodic tidal potential series in the numerical
approach.
Segatz, M., Spohn, T., Ross, M. N., Schubert, G. (1988). Tidal dissipation,
surface heat flow, and figure of viscoelastic models of Io. Icarus, 75(2), 187-206. |
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