The nature of the interior of Uranus based on studies of planetary ices at high dynamic pressure

Details The nature of the interior of Uranus based on studies of planetary ices at high dynamic pressure The nature of the interior of Uranus based on studies of planetary ices at high dynamic pressure

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988sci...240..779n&link_type=abstract

Science (ISSN 0036-8075), vol. 240, May 6, 1988, p. 779-781. Research supported by the University of California.

Computer Science

39

Dynamic Pressure, Equations Of State, Ice, Planetary Magnetic Fields, Planetary Structure, Uranus (Planet), Ammonia, Dynamo Theory, Electrical Resistivity, Methane, Voyager 2 Spacecraft, Uranus, Interior, Pressure, Spacecraft Observations, Voyager 2 Mission, Magnetic Fields, Geometry, Origin, Electrical Properties, Conductivity, Ice, Equations Of State, Ammonia, Methane, Temperature, Parameters, Depth, Shock Effects, Compression, Analogs

Scientific paper

Data from the Voyager II spacecraft showed that Uranus has a large magnetic field with geometry similar to an offset tilted dipole. To interpret the origin of the magnetic field, measurements were made of electrical conductivity and equation-of-state data of the planetary 'ices' ammonia, methane, and 'synthetic Uranus' at shock pressures and temperatures up to 75 gigapascals and 5000 K. These pressures and temperatures correspond to conditions at the depths at which the surface magnetic field is generated. Above 40 gigapascals the conductivities of synthetic Uranus, water, and ammonia plateau at about 20/(ohm-cm), providing an upper limit for the electrical conductivity used in kinematic or dynamo calculations. The nature of materials at the extreme conditions in the interior is discussed.

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