Journal ArticleDOI
Io on the eve of the galileo mission
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Io, the innermost of Jupiter's large moons, is one of the most unusual objects in the Solar System as discussed by the authors, which produces a global heat flux 40 times the terrestrial value, producing intense volcanic activity and a global resurfacing rate averaging perhaps 1 cm yr−1.Abstract:
▪ Abstract Io, innermost of Jupiter's large moons, is one of the most unusual objects in the Solar System. Tidal heating of the interior produces a global heat flux 40 times the terrestrial value, producing intense volcanic activity and a global resurfacing rate averaging perhaps 1 cm yr−1. The volcanoes may erupt mostly silicate lavas, but the uppermost surface is dominated by sulfur compounds including SO2 frost. The volcanoes and frost support a thin, patchy SO2 atmosphere with peak pressure near 10−8 bars. Self-sustaining bombardment of the surface and atmosphere by Io-derived plasma trapped in Jupiter's magnetosphere causes escape of material from Io (predominantly sulfur, oxygen, and sodium atoms, ions, and molecules) at a rate of about 103 kg s−1. The resulting Jupiter-encircling torus of ionized sulfur and oxygen dominates the Jovian magnetosphere and, together with an extended cloud of neutral sodium, is readily observable from Earth.read more
Citations
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Journal ArticleDOI
High-Resolution Keck Adaptive Optics Imaging of Violent Volcanic Activity on Io
Franck Marchis,I. de Pater,Ashley Davies,Henry G. Roe,Thierry Fusco,D. Le Mignant,Pascal Descamps,Bruce Macintosh,R. Prange +8 more
TL;DR: In this paper, the authors report on near-IR observations taken in February 2001 from the Earth-based 10m W. M. Keck II telescope using its adaptive optics system.
Journal ArticleDOI
Magmatic Differentiation of Io
TL;DR: In this paper, the authors employ a widely used thermodynamic model of silicate melts to examine the effect of repeated differentiation of the silicate portion of Io and make some robust conclusions.
Journal ArticleDOI
Ion cyclotron waves in the Io torus: Wave dispersion, free energy analysis, and SO2 + source rate estimates
D. E. Huddleston,Robert J. Strangeway,J. Warnecke,Christopher T. Russell,Margaret G. Kivelson +4 more
TL;DR: In this paper, a free energy analysis for wave-particle scattering of ions toward a "bispherical" shell-type distribution was performed to estimate the ion production rate for SO2+ of ∼8×1026/s, representing the small fraction of molecules that survive in molecular form long enough to be ionized and generate waves before dissociation.
Journal ArticleDOI
Discovery of chlorine in the Io torus
TL;DR: In this paper, the discovery of singly ionized chlorine in the Io plasma torus through the detection of emission at 857.9 nm corresponds to a Cl + abundance of 2±0.5% relative to all ions.
Journal ArticleDOI
Observations and temperatures of Io's Pele Patera from Cassini and Galileo spacecraft images
Jani Radebaugh,Alfred S. McEwen,M. P. Milazzo,Laszlo P. Keszthelyi,Ashley Davies,Elizabeth P. Turtle,D. D. Dawson +6 more
TL;DR: A suite of characteristics suggests that Pele is an active lava lake inside a volcanic depression as mentioned in this paper, indicating that a significant portion of the visible thermal emission from Pele comes from lava fountains within a topographically confined lava body.
References
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Journal ArticleDOI
Extreme ultraviolet observations from Voyager 1 encounter with Jupiter
A. L. Broadfoot,M. J. S. Belton,P. Z. Takacs,Bill R. Sandel,Donald E. Shemansky,Jay B. Holberg,Joseph M. Ajello,Sushil K. Atreya,Thomas M. Donahue,H. W. Moos,Jean-Loup Bertaux,J. E. Blamont,Darrell F. Strobel,John C. McConnell,Alexander Dalgarno,Richard Goody,Michael B. McElroy +16 more
TL;DR: The observed resonance scattering of solar hydrogen Lyman α by the atmosphere of Jupiter and the solar occultation experiment suggest a hot thermosphere (≥ 1000 K) wvith a large atomic hydrogen abundance.
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Melting of Io by Tidal Dissipation
TL;DR: The dissipation of tidal energy in Jupiter's satellite Io is likely to have melted a major fraction of the mass, and consequences of a largely molten interior may be evident in pictures of Io's surface returned by Voyager I.
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Inertial limit on corotation
TL;DR: In this article, the inertial corotation lag is calculated as a function of radial distance in the magnetosphere, the solution being parameterized in terms of the Pedersen conductivity of the atmosphere and the rate at which plasma mass is produced and transported outward.
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Physics of the Jovian Magnetosphere
TL;DR: In this paper, the authors considered the physics of magnetospheric radio emissions, plasma waves in the Jovian magnetosphere, theories of radio emissions and plasma waves, and magnetosphere models.