The flux of interstellar dust observed by ULYSSES and Galileo

Details The flux of interstellar dust observed by ULYSSES and Galileo The flux of interstellar dust observed by ULYSSES and Galileo

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ssrv...72..471b&link_type=abstract

Space Science Reviews, Volume 72, Issue 1-2, pp. 471-476

Physics

45

Interstellar Dust, Ulysses Dust Measurements, Galileo Dust Measurements

Scientific paper

Interstellar dust detected by the dust sensor onboard Ulysses was first identified after the Jupiter flyby when the spacecraft's trajectory changed dramatically (Grün et al., 1994). Here we report on two years of Ulysses post-Jupiter data covering the range of ecliptic latitudes from 0° to -54° 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 3·10-13 g stays nearly constant at about 1·10-4, m-2 s-1 (π sr)-1, 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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