Timing of the Martian dynamo
Article Abstract:
It is been generally believed that the core dynamo that once drove Mars' magnetic field switched off over 4 billion years ago, but new research suggests that the Martian dynamo switched on 4 billion years ago before switching off at a later, unknown time.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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Gravitational evidence for an undifferentiated Callisto
Article Abstract:
The fly-bys conducted by the Galileo spacecraft involving Jupiter's four galilean satellites show differences in the internal structure of these moons. Callisto is significantly different from Io and Ganymede due to its homogenous structure, which is composed of compressed ice and rock. In addition, the satellite lacks an intrinsic magnetic field and insufficient heating phase.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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Induced magnetic fields as evidence for subsurface oceans in Europa and Callisto
Article Abstract:
Perturbations of the external magnetic fields around Europa and Callisto, Jupiter satellites, are reported. They are believed to arise from induced magnetic fields, generated in response to the varying plasma environment. It is likely that there significant layers of electrical conductivity just under the surfaces of both moons, and that the conducting layers can be explained by the presence of salty liquid-water oceans.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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