Physics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgre..11510008n&link_type=abstract
Journal of Geophysical Research, Volume 115, Issue E10, CiteID E10008
Physics
3
Planetary Sciences: Solar System Objects: Saturnian Satellites, Planetary Sciences: Solid Surface Planets: Interiors (8147), Planetary Sciences: Solid Surface Planets: Gravitational Fields (1221), Planetary Sciences: Solid Surface Planets: Heat Flow
Scientific paper
We use limb profiles to investigate the long-wavelength topography and topographic variance spectrum of Rhea. One-dimensional variance spectra show a break in slope at a wavelength of ≈300 km; a similar effect is seen on the Moon and may be a signature of an elastic lithosphere having a thickness Te ≈ 10 km. The implied heat flux is ˜15 mW m-2, much higher than can be explained by radiogenic heating. We use the 1-D spectral behavior to constrain our solution for the long-wavelength global topography of Rhea. The degree 3 topography is large enough, if uncompensated, to contaminate estimates of the degree 2 gravity using existing flyby data. Current models of Rhea internal structures which rely on these degree 2 estimates may thus be inaccurate, illustrating the need to acquire further Rhea gravity data.
Asmar Sami W.
Bills Bruce G.
Nimmo Francis
Thomas Peter C.
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