Internal structur2

Internal structur2 - assumed composition of silicates...

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Internal structure Model of Ganymede's interior showing a cold rigid ice crust, an outer warm ice mantle, an inner silicate mantle, and a metallic core. Ganymede appears to be fully differentiated, consisting of an iron sulfide iron core , silicate mantle and an outer ice mantle. [5] [39] This model is supported by the low value of its dimensionless [h] moment of inertia (0.3105 ± 0.0028), which was measured during Galileo flybys. [5] [39] In fact, Ganymede has the lowest moment of inertia among the solid Solar System bodies. The existence of a liquid, iron-rich core provides a natural explanation for the intrinsic magnetic field of Ganymede detected by Galileo . [40] The convection in the liquid iron, which has high electrical conductivity , is the most reasonable model of magnetic field generation. [17] The precise thicknesses of the different layers in the interior of Ganymede depend on the
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Unformatted text preview: assumed composition of silicates (fraction of olivine and pyroxene ) and amount of sulfur in the core. [30] [39] The most probable values are 700900 km for the core radius and 8001000 km for the thickness of the outer ice mantle, with the remainder being made by the silicate mantle. [39] [40] [41] [42] The density of the core is 5.56 g/cm 3 and the silicate mantle is 3.43.6 g/cm 3 . [30] [39] [40] [41] Some models of the magnetic field generation require the existence of a solid core made of pure iron inside the liquid FeFeS coresimilar to the structure of the Earth's core. The radius of this core may be up to 500 km. [40] The temperature in the core of Ganymede is probably 1500 1700 K and pressure up to 10 GPa...
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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