[1] This paper focuses on the dust environment between the orbits of the Galilean moons of Jupiter. Recent discovery of dust clouds around the Galilean satellites formed by impact ejecta from hypervelocity impacts of interplanetary micrometeoroids [Krüger et al., 1999d] suggests that a fraction of the ejected particles may escape from the source satellites into circum-Jovian orbits. We estimate production rates and study dynamical evolution of the escaping ejecta, controlled by gravitational, radiation pressure, and electromagnetic forces, to show that grains larger than several tenths of a micrometer in radius are likely to stay in bound orbits around Jupiter for tens or hundreds of years until they either are lost to collisions with the satellites or Jupiter or are ejected to interplanetary space. It is concluded that these small debris form a broad dust ring with number densities up to $10 3 km À3 , extending at least from Europa's orbit outward beyond the orbit of Callisto. Our results are consistent with in situ measurements of the Galileo spacecraft. We analyze impact events recorded by the Galileo dust detector from 1996 through 2001 and find more than 200 events outside the orbit of Europa, compatible with impacts of particles orbiting Jupiter in prograde orbits. An empirical dust number density distribution derived from these data agrees quite well with the theoretical one.

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AbsWd-In this project a system for realtime airborne areal traffic monitoring has b e n designed. implemented and demonstrated in Berlin.The system encompnues the following steps: image and attitude recording aboard an aircraft, image preprocessing and transfer to ground, further image processing for extracting the traffic data and aggregation of traffic data and their input into newly developed simulation and prognosis tools to close the gaps between overtlights. The system is completed by an open interface to service companies that support end nsen with traffic information and recommendations.The technological challenges were on the software side the development of appropriate fast image processing methods and new traffic simulation and prognosis tools and on the hardware side the integration of all components and subsystems to a working complete system. A major aim of the project was the comparison of the new approach with established methods of traffie monitoring w.r.t accuracy and effieiancy.For validating the complete LUMOS concept and its implcmrntstion a flight campaign wps prrfwmrd by the DLRlnstihlle of Transport Research and the other project partners in the area of Berlin in May 2003.First resultr ofcomparison of airborne and conventional traffic measurements are presented in this paper.Besides DLR, the following partner collaborate within

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