When Galileo met Ganymede

  title={When Galileo met Ganymede},
  author={David J. Stevenson},
Jupiter's satellite Ganymede has a magnetic field. Its cause could be an internal dynamo that was kick-started a billion years ago when the satellite was temporarily pushed into a more eccentric orbit. 
Galileo at Jupiter — meetings with remarkable moons
The four large moons of Jupiter — Io, Europa, Ganymede, and Callisto — form the most coherently organized planetary system known. Over the past two years, the Galileo spacecraft has deepened ourExpand
Interior composition, structure and dynamics of the Galilean satellites
Gravitational fiels of the satellites: flyby determination of C22, gravity results; Io, Europa, Ganymede, Callisto - interior models; Thermal considerations in the maintenance of intra-ice oceans onExpand
Tidal instability as the source for Io's magnetic signature
Recent observations from the Galileo spacecraft suggest that Io, the innermost of Jupiter's satellites, has a magnetic signature. Remanent magnetization appears inadequate to explain this signal and,Expand
A Study Of Internal Structure Models And Dynamical Parameters Of Ganymede
Jupiter's satellite Ganymede is the largest natural satellite in the Solar System. As a result of the close encounter of Ganymede by the Galileo spacecraft in June and September 1996, the secondExpand
The production of Ganymede's magnetic field
Abstract One of the great discoveries of NASA's Galileo mission was the presence of an intrinsically produced magnetic field at Ganymede. Generation of the relatively strong (750 nT) field likelyExpand
Cratering rates on the Galilean satellites.
It is found that most, probably more than 90%, of the craters on the Galilean satellites are caused by the impact of Jupiter-family comets (JFCs), these are comets with short periods, in generally low-inclination orbits, whose dynamics are dominated by Jupiter. Expand
The Tectonic, Thermal and Magnetic Evolution of Icy Satellites
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Internal structure and dynamics of the large icy satellites
Abstract The magnetic data returned by the Galileo mission suggest that deep oceans are present within the icy Galilean satellites. In addition, tectonic features on Europa are consistent with modelsExpand
Thermal Evolution and Magnetic Field Generation in Terrestrial Planets and Satellites
Of the terrestrial planets, Earth and Mercury have self-sustained fields while Mars and Venus do not. Magnetic field data recorded at Ganymede have been interpreted as evidence of a self-generatedExpand
Composition des océans des lunes de Jupiter et Saturne : approches thermodynamique et expérimentale
The existence of subsurface aqueous oceans in Jupiter and Saturn’s large icy moons, theorized in the 1970s, has been confirmed by data collected by the Voyager, Galileo and Cassini-Huygens missions.Expand


Discovery of Ganymede's magnetic field by the Galileo spacecraft
THE Galileo spacecraft has now passed close to Jupiter's largest moon—Ganymede—on two occasions, the first at an altitude of 838 km, and the second at an altitude of just 264 km. Here we report theExpand
Evidence for a magnetosphere at Ganymede from plasma-wave observations by the Galileo spacecraft
ON 27 June 1996 the Galileo spacecraft1,2 made the first of four planned close fly-bys of Ganymede, Jupiter's largest moon. Here we report measurements of plasma waves and radio emissions, over theExpand
Gravitational constraints on the internal structure of Ganymede
BEFORE the arrival of the Galileo spacecraft in the jovian system, there was little information on the interior structure of Jupiter's largest moon, Ganymede. Its mean density (1,940 kg m−3),Expand
A Magnetic Signature at Io: Initial Report from the Galileo Magnetometer
During the inbound pass of the Galileo spacecraft, the magnetometer acquired 1 minute averaged measurements of the magnetic field along the trajectory as the spacecraft flew by Io, and it seems plausible that Io, like Earth and Mercury, is a magnetized solid planet. Expand
The magnetic field and internal structure of Ganymede
BEFORE the recent fly-bys of Ganymede by the Galileo spacecraft, viable models of the internal structure of Jupiter's largest moon ranged from a uniform mixture of rock and ice to a differentiatedExpand
Chaotic Motion of Europa and Ganymede and the Ganymede-Callisto Dichotomy
The tidal effects on Ganymede during this episode provide an explanation of the dichotomy between it and Callisto, which have similar bulk properties but very different geological histories. Expand
Galileo Gravity Results and the Internal Structure of Io
Doppler data generated with the Galileo spacecraft's radio carrier wave were used to measure Io's external gravitational field, and the inescapable conclusion is that it has a large metallic core. Expand
Tidal origin of the Laplace resonance and the resurfacing of Ganymede
Abstract I present a new scenario for the tidal origin of the Laplace resonance. The inner three Galilean satellites are supposed to have formed in orbits well away from the 2/1 pair-wise mean motionExpand
Planetary magnetic fields
As a consequence of the smallness of the electronic fine structure constant, the characteristic time scale for the free diffusive decay of a magnetic field in a planetary core is much less than theExpand