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Tidal Heating and Convection in the Medium Sized Icy Satellites

Celestial Mechanics and Dynamical Astronomy volume 87, pages 157–169 (2003)Cite this article

Abstract

Surface features of some icy satellites indicate that the satellites are modified due to the internally driven tectonic activity. Convection could be one of the processes responsible for the formation of the surface features. The potential sources of energy inside the satellites are discussed. For the medium sized icy satellites the radiogenic and tidal heat sources seem to be of primary importance. To investigate the problem, a 3D model of convection is developed based on the Navier–Stokes equation, the equation of thermal conductivity, the equation of continuity, and the equation of state. The model includes both the tidal and the radiogenic heating. It can be applied to the homogeneous, non-differentiated medium sized satellites. The 3D formulae for tidal heat generation and stress tensor based on the results of Peale and Cassen (1978) and others are applied. A new dimensionless number C t is introduced. It measures the relative importance of tidal and radiogenic heat sources. The systematic investigation of the steady-state convection is performed for different values of the Rayleigh number and for 0≤C t ≤1. The results indicate that the convection pattern for low Rayleigh number driven by tidal heating in the medium sized icy satellites consists of two cells. The pattern of tidally driven convection is oriented, that is, the regions of downward motion are situated at the center of the near- and of the far-side of the satellite.

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Authors and Affiliations

  1. Institute of Geophysics, University of Warsaw, Pasteura 7, 02-093, Warsaw, Poland e-mail

    L. Czechowski & J. Leliwa-Kopystyński

  2. Space Research Center of Polish Academy of Sciences, Bartycka 18A, 00-716, Warsaw, Poland, e-mail

    J. Leliwa-Kopystyński

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  1. L. Czechowski
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  2. J. Leliwa-Kopystyński
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Czechowski, L., Leliwa-Kopystyński, J. Tidal Heating and Convection in the Medium Sized Icy Satellites. Celestial Mechanics and Dynamical Astronomy 87, 157–169 (2003). https://doi.org/10.1023/A:1026136025400

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  • DOI: https://doi.org/10.1023/A:1026136025400

  • icy satellites
  • solid-state convection
  • tectonics
  • tidal interactions