Hamilton, D.P. and J.A. Burns 1993. Ejection of dust from Jupiter's
gossamer ring. Nature 364, 695-699.
One of the most remarkable discoveries of the Ulysses spacecraft to
date has been the detection of periodic, hypervelocity, collimated
streams of tiny dust particles emanating from Jupiter; in all, at
least six distinct events were identified (Fig.~1)\Grunc\and\Grund.
Horanyi \etal recently showed that electromagnetic forces can eject
positively charged dust from Jupiter's magnetosphere and suggested an
Io source\Horanyia; we argue here that the mass and velocity ranges of
detected particles are more consistent with a source in Jupiter's
gossamer ring. After exiting the jovian magnetosphere, particles are
further accelerated by the interplanetary magnetic field, the time
history of which primarily determines which particles will reach the
spacecraft. Our model of the interplanetary acceleration predicts
three features present in the Ulysses data: fewer streams before
closest approach than after, a periodicity of approximately 28 days
resulting from changes in the solar wind, and, perhaps most
interestingly, an extremely intense stream immediately after closest
approach.
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