Baguhl, M., E. Grün, D.P. Hamilton, G. Linkert, R. Riemann,
P. Staubach and H. Zook 1995. The flux of interstellar dust
observed by Ulysses and Galileo. Spa. Sci. Rev
72, 471-476.
Interstellar dust detected by the dust sensor onboard Ulysses was
first identified after the Jupiter flyby when the spacecraft's
trajectory changed dramatically (Gr\"un et al., 1994). Here we report
on two years of Ulysses post-Jupiter data covering the range of
ecliptic latitudes from 0\deg to -54\deg and distances from 5.4 to
3.2~AU. We find that, over this time period, the flux of interstellar
dust particles with a mean mass of $3\cdot 10^{-13}$~g stays nearly
constant at about $1\cdot 10^{-4}$~\fluxunits~with both ecliptic
latitude and heliocentric distance.
Also presented are 20 months of measurements from the identical dust
sensor onboard the Galileo spacecraft which moved along an in-ecliptic
orbit from 1.0 to 4.2~AU. From the impact direction and speeds of the
measured dust particles we conclude that Galileo almost certainly
sensed interstellar dust outside 2.8~AU; interstellar particles may
also account for part of the flux seen between 1 and 2.8 AU.
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