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Title:
Internal structure of Io and the global distribution of its topography
Authors:
Ross, M. N.; Schubert, G.; Spohn, T.; Gaskell, R. W.
Affiliation:
AA(Aerospace Corp., Space Sciences Laboratory, Los Angeles, CA), AB(California, University, Los Angeles), AC(Muenster, Universitaet, Federal Republic of Germany), AD(JPL, Pasadena, CA)
Publication:
Icarus (ISSN 0019-1035), vol. 85, June 1990, p. 309-325. (Icarus Homepage)
Publication Date:
06/1990
Category:
Lunar and Planetary Exploration; Satellites of Jupiter
Origin:
STI; LPI [AN-900553%J] ttp://www.sti.nasa.gov/STI-public-homepage.html
NASA/STI Keywords:
HEAT TRANSMISSION, IO, SATELLITE ATMOSPHERES, SATELLITE SURFACES, TOPOGRAPHY, GALILEAN SATELLITES, LITHOSPHERE, PLANETARY MANTLES
LPI Keywords:
JUPITER, SATELLITES, IO, INTERIOR, STRUCTURE, DISTRIBUTION, TEMPERATURE, TOPOGRAPHY, ASTHENOSPHERE, VISCOSITY, MANTLE, MODELS, HEAT FLOW, BASINS, TIDAL EFFECTS, THICKNESS, DENSITY, DIAGRAMS, DISSIPATION, TEMPERATURE, EQUATORIAL REGIONS
DOI:
10.1016/0019-1035(90)90119-T
Bibliographic Code:
1990Icar...85..309R

Abstract

A global topography is presently calculated for two multilayer Io models in which dissipation occurs in a viscous asthenosphere and a solid mantle: (1) a 'thermal swell' model, in which topography and heat flow are positively correlated, and (2) a 'differentiated lithosphere' model, in which topography and heat flow are negatively correlated. Both the polar topography and the hypsometric distribution of elevations in the differentiated lithosphere model are better matched with observations than the thermal swell model. The shift of the equatorial basin-swell pattern indicates a recent zonal rotation of about 25 deg for Io's lithosphere.
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