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  • LUNAR AND PLANETARY EXPLORATION  (4)
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  • 1
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    Unknown
    Sweeping of the Jovian resonances and the evolution of the asteroids (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: During the formation of the solar system the variation of the gravitational field produced by removal of a nebula with its moderately massive accretion disk led to sweeping of the Jovian commensurability resonances through the asteroid zone. This process produced increased eccentricities and random velocities of the early planetesimals which resulted in collisional comminution rather than accretion. The existence of the asteroids, their low mass density, and their high relative velocities are interpreted as due to disruption of the accretion processes of the terrestrial planets by the influences of Jupiter.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 44; Dec. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Hydromagnetic dynamo in the cores of Uranus and Neptune (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: It is noted that the explanation of the origin of a magnetic field of Uranus is difficult because the structure of the planet's interior is not well known and the strong thermal flux, which is associated with the operation of hydromagnetic dynamos in Jupiter and Saturn, seems to be absent or very low. It is shown that the composition, physical state and electrical conductivity of the planet's core permits the generation of a magnetic field within the very low observational limits of its heat emission. Further, it is suggested that the higher density and higher pressures in the core of Neptune could explain the suspected absence of a measurable field on that planet even though it is a relatively strong source of heat.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 286; July 17
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The structure and the magnetic field of Uranus (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The two-layer model of Uranus is recalculated using a rotation period of 24 rather than 10.8 hours and also the melting temperatures of H2O and of the constituents of the core are evaluated. It appears that the core is solid and the H2O-containing mantle is liquid. The conductivities of H2O, 'metallic' H2 and metallic H are roughly in the ratio of 1:100:10000 so that the convective velocities required for the operation of a dynamo would have to be about 10, 0.1 and 0.001 cm/sec, respectively. The very low thermal flux from Uranus suggests that, unless a precessional dynamo is invoked, metallically conducting H2 or metallic hydrogen has to be present in the mantle.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 6; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The core and the magnetic field of Uranus (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The existence of a magnetic field on Uranus is suggested by the tentative observation of 0.5 MHz pulses from the planet which are analogous to the Jovian decametric radiation. Analysis of a recent three-layer model leads to the conclusion that the electrical conductivity, physical state, and thermal gradients are such that a thermally driven hydromagnetic dynamo is probably operating in the core. An investigation is conducted to see whether the considered structure is suitable for the generation of a field. It is found that the existence of a magnetic field on Uranus can be understood as being a natural result of gravitational differentiation in a liquid, metallic core. The presence of a heat source in the core implies that the central temperature is approximately 8400 K rather than 7000 K in the original model
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 17, 1980 - Mar 21, 1980; Houston, TX
    Format: text
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