Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500...71d&link_type=abstract
In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed
Physics
Space Missions: Pioneer 11
Scientific paper
The data of the Pioneer 11 meteoroid experiment taken between 3 and 5 AU are tested against a new meteoroid model. The data are interesting for they show no gap in the impact rate during temporary sunward motion of the spacecraft after Jupiter fly-by, when the measurement conditions did not favour particles on near-circular, near-ecliptic orbits populated densely in the inner zodiacal cloud. A hypothesis of presence of dust particles on highly eccentric or highly inclined orbits was originally proposed to explain the data, however, no dynamical proof was given that such a population might exist. The new meteoroid model constraints dynamically the orbital distributions of dust particles in the region of encounters with Jupiter, including - for the first time - the particles ejected from the Solar system by Jupiter. It is found that the data cannot be explained by the model consistently. The measurements could be due to a population that has not interacted with Jupiter - a transient phenomenon or fresh material from the long-period comets.
Dikarev Valeri V.
Grün Eberhard
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