Krüger, H., E. Grün, M. Landgraf, M. Baguhl,
S. Dermott, H. Fechtig, B.A. Gustafson, D.P. Hamilton, M.S. Hanner,
M. Horanyi, J. Kissel1, B.A. Lindblad, D. Linkert, G. Linkert, I.
Mann, J.A.M. McDonnell, G.E. Morfill, C. Polanskey, G. Schwehm, R.
Srama, and H.A. Zook. Three years of Ulysses dust data:
II. 1993 to 1995. Planet. Space Sci.
The Ulysses spacecraft orbits the Sun on a highly inclined ellipse
(i=90). After its Jupiter flyby in 1992 at a heliocentric distance of
5.4 AU, the spacecraft approached the inner solar system, flew over
the Sun's south polar region in September 1994, crosses the ecliptic
plane at a distance of 1.3 AU in March 1995 and flew over the Sun's
north polar region in July 1995. We report on dust impact data
obtained with the dust detector onboard Ulysses between January 1993
and December 1995. We publish and analyse the complete data set of 509
recorded impacts of dust particles with masses between
10-16 g to 10-7g. Together with 968 dust
impacts from launch until the end of 1992 published earlier, a set of
1477 particles detected with the Ulysses sensor between October 1990
and December 1995 is now available. The impact rate measured between
1993 and 1995 stayed relatively constant at about 0.2 impacts per day
and a variation by less than a factor of ten. Most of the recorded
impacts are compatible with particles of interstellar origin. Two
populations of interplanetary particles have been recognised: big
micrometer sized particles close to the ecpliptic plane and small
sub-micrometer sized particles above the Sun's polar regions. The
observed impact rate is compared with a model for the flux of
interstellar dust particles.
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