Grün, E., H. Krüger, S. Dermott, H. Fechtig,
A.L. Graps, H.A. Zook, B.A. Gustafson, D.P. Hamilton, M.S. Hanner,
A. Heck, M. Horanyi, J. Kissel, B.A. Lindblad, D. Linkert,
G. Linkert, I. Mann, J.A.M. McDonnell, G.E. Morfill, C. Polanskey,
G. Schwehm and R. Srama. Dust measurements in the jovian
magnetosphere. Geophys.
Res. Let. 24, 2171-2174.
Dust measurements have been obtained with the dust detector onboard
the Galileo spacecraft inside a distance of about 60 $R_J$ from
Jupiter (Jupiter radius, $R_J = 71,492$km) during two periods of about
8 days around Galileo's closest approaches to Ganymede on 27 June and
on 6 Sept 1996. The impact rate of submicrometer-sized particles
fluctuated by a factor of several hundred with a period of about 10
hours, implying that their trajectories are strongly affected by the
interaction with the Jovian magnetic field. Concentrations of small
dust impacts were detected at the times of Ganymede closest approaches
that could be secondary ejecta particles generated upon impact of
other particles onto Ganymede's surface. Micrometer-sized dust
particles, which could be on bound orbits about Jupiter, are
concentrated in the inner Jovian system inside about 20 $R_J$ from
Jupiter.
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