Galileo observes electromagnetically coupled dust in the Jovian magnetosphere

Grun, E. and Kruger, H. and Graps, A.L. and Hamilton, D.P. and Heck, A. and Linkert, G. and Zook, Harald and Dermott, S. and Fechtig, H. and Gustafson, B.A. and Hanner, M.S. and Horanyi, M. and Kissel, Jochen and Lindblad, B.A. and Linkert, D. and Mann, I. and McDonnell, J.A.M. and Morfill, G.E. and Polanskey, C. and Schwehm, G. and Srama, Ralf (1998) Galileo observes electromagnetically coupled dust in the Jovian magnetosphere. In: Journal of Geophysical Research-Planets. American Geophysical Union pp. 20011-20022. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Measurements of dust coupled to the Jovian magnetosphere have been obtained with the dust detector on board the Galileo spacecraft. We report on data obtained during the first four orbits about Jupiter that had flybys of the Galilean satellites: Ganymede (orbits 1 and 2), Callisto (orbit 3), and Europa (orbit 4). The most prominent features observed are highly time variable dust streams recorded throughout the Jovian system. The impact rate varied by up to 2 orders of magnitude with a 5 and 10 hour periodicity, which shows a correlation with Galileo's position relative to the Jovian magnetic field. Around 20 R-J (Jupiter radius, R-J = 71,492 km) in bound a dip in the impact rate has been found consistently. At the same times, reversals by 180 degrees 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 micrometer-sized particles have been recorded that could be particles on bound orbits about Jupiter.

Item Type: Conference or workshop item (Paper)
Additional information: Conference on Magnetospheres of the Outer Planets BOULDER, COLORADO, MAR 17-21, 1997 NASA, Jet Prop Lab, Galileo Project
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: R.F. Xu
Date Deposited: 08 Jul 2009 13:20
Last Modified: 18 Jul 2014 08:36
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