Grün, E., H. Krüger, A.L. Graps, D.P. Hamilton, A. Heck, G. Linkert, H.A. Zook, S. Dermott, H. Fechtig, B.A. Gustafson, M.S. Hanner, M. Horanyi, J. Kissel, B.A. Lindblad, D. Linkert, I. Mann, J.A.M. McDonnell, G.E. Morfill, C. Polanskey, G. Schwehm and R. Srama. Galileo Observes Electromagnetically Coupled Dust in the Jovian Magnetosphere. JGR 103, 20,011-20,022.

Measurements of dust coupled to the jovian magnetosphere have been obtained with the dust detector onboard the Galileo spacecraft. We report on data obtained during the first four orbits about Jupiter that had flybys of the Galilean satellites: Ganymede (orbit number: 1 and 2), Callisto (3), and Europa (4). The most prominent features observed are highly time variable dust streams. The impact rate varied by up to two orders of magnitude with a 5 and 10 h periodicity, that shows a correlation with Galileo's position in the jovian magnetic field. Around 20 $R_J$ (Jupiter radius, $R_J = 71492$km) inbound a dip in the impact rate has been found consistently. At the same times reversals by 180 in impact direction occurred. This behavior can be qualitatively explained by strong coupling of nanometer sized dust to the jovian magnetic field. At times of satellite flybys enhanced rates of dust impacts have been observed which suggests that all Galilean satellites are sources of ejecta particles. Inside about 20 $R_J$ impacts of big particles have been recorded that could be particles on bound orbits about Jupiter.
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