Grün, E., M. Baguhl, N. Divine, H. Fechtig, D.P. Hamilton,
M.S. Hanner, J. Kissel, B.-A. Lindblad, D. Linkert, G. Linkert,
I. Mann, J.A.M. McDonnell, G.E. Morfill, C. Polanskey, R. Riemann,
G. Schwehm, N. Siddique, P. Staubach and H.A. Zook 1995. Two years of
Ulysses dust data. Planet. Space Sci., 43, #8, 953-969.
From October 18, 1990 to Feb. 8, 1992 the Ulysses spacecraft traversed
interplanetary space between the Earth and Jupiter; at Jupiter the
spacecraft was deflected below the ecliptic on a highly inclined orbit
(i $\sim 80$\degn). Here, we report on dust impact data obtained from
launch until the end of 1992, nearly a year after the Jupiter
flyby. During that time (792 days), the Ulysses dust detector recorded
968 impacts of dust particles with masses ranging from $10^{-16}$~g to
$10^{-8}$~g. The impact rate varied from as low as one impact per week
during quiet times to more than one per minute during the dust stream
of March 10-11, 1992. In this paper, we present and describe the
complete data set including both raw and reduced data. The performance
of the sensor, which has been very satisfactory so far, is discussed
in detail together with the noise discrimination scheme employed. The
instrument's detection threshold is given as a function of both the
particle's mass and its speed relative to Ulysses. The derived impact
rates and the distribution of particle masses, speeds and impact
directions are compared to a model of the meteoroid complex.
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