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At least 145 records · Page 8Linked to original sources
PubMed1998

From Jupiter's Great Red Spot to the structure of galaxies: statistical mechanics of two-dimensional vortices and stellar systems.

The statistical mechanics of two-dimensional vortices and stellar systems both at equilibrium and out of equilibrium are discussed, with emphasis on the analogies (and on the differences) between these two systems. Limitations of statistical theory and problems posed by the long-range nature of the interactions are described in detail. Special attention is devoted to the problem of "incomplete relaxation" and, in the case of stellar systems, to the "gravothermal catastrophe." The relaxation toward equilibrium, possibly restricted to a "maximum entropy bubble," is described with the aid of a maximum entropy production principle (MEPP). The relation with Fokker-Planck equations is made explicit and the structure of the diffusion current analyzed in terms of a pure diffusion compensated by an appropriate friction or a drift.

Journal Article↗
PubMed2004

Surface of young Jupiter family comet 81P/Wild 2: view from the Stardust Spacecraft.

Images taken by the Stardust mission during its flyby of 81P/Wild 2 show the comet to be a 5-kilometer oblate body covered with remarkable topographic features, including unusual circular features that appear to be impact craters. The presence of high-angle slopes shows that the surface is cohesive and self-supporting. The comet does not appear to be a rubble pile, and its rounded shape is not directly consistent with the comet being a fragment of a larger body. The surface is active and yet it retains ancient terrain. Wild 2 appears to be in the early stages of its degradation phase as a small volatile-rich body in the inner solar system.

Cosmic Dust↗
PubMed1996

Comparison of Galileo Probe and Earth-Based Translation Rates of Jupiter's Equatorial Clouds

The Doppler wind speeds derived from Galileo probe data are comparable with the maximum translation speeds observed in the equatorial zone by Voyager 1 and the Hubble Space Telescope. Slower published values of east-west winds are based on measurements of larger features and should be interpreted as translation rates of large weather systems interacting with the wind. The nature of the hot-spot region that the Galileo probe entered is compatible with a high-speed jet at 6 degrees north. The hot spot is associated with an equatorial weather system that spans 5 degrees of latitude and translates at 103 meters per second.

Journal Article↗
PubMed1997

Earth-Based Radio Tracking of the Galileo Probe for Jupiter Wind Estimation

Although the Galileo probe was designed to communicate only to the orbiter, the probe radio signal was detected at two Earth-based radio observatories where the signal was a billion times weaker. The measured signal frequency was used to derive a vertical profile of the jovian zonal wind speed. Due to the mission geometry, the Earth-based wind estimates are less sensitive to descent trajectory errors than estimates based on probe-orbiter Doppler measurements. The two estimates of wind profiles agree qualitatively; both show high wind speeds at all depths sampled.

Journal Article↗