Computer Science
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2330..291h&link_type=abstract
In JPL Uranus and Neptune p 291-325 (SEE N85-11927 02-91)
Computer Science
4
Planetary Cores, Planetary Evolution, Structural Properties (Geology), Uranus (Planet), Helium Hydrogen Atmospheres, Neptune (Planet), Planetary Gravitation, Planetary Magnetic Fields, Planetary Mass, Planetary Rotation, Planetary Temperature
Scientific paper
Key measurements are discussed which are diagnostic of Uranus' interior structure and evolutionary history, and reviews their present status. Typical interior models have chondritic cores, but have the bulk of their mass in an envelope consisting of ice component, principally H2O. The total amount of free H2 in the planet cannot exceed approximately 1 to 2 earth masses. Measurements of the gravitational moments of Uranus are beginning to be accurate enough to constrain models, but are limited in utility by uncertainty in the rotation period. Discussed is evidence that the outermost planetary layers have a gravitationally significant quantity of denser material (ice component?) in addition to H2 and He. The He/H ratio and the deuterium abundance in the atmosphere may be diagnostic of the planet's previous evolutionary history. It is argued that the planet's interior is likely to now be at a temperature approximately 10(3) deg K. Uranus' interior with Neptune's in a number of ways, considering heat flow, degree of internal differentiation, and possible magnetic field.
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