Micron-Sized Dust Particles Detected in the Outer Solar System by the Voyager 1 and 2 Plasma Wave Instruments

Details Micron-Sized Dust Particles Detected in the Outer Solar System by the Voyager 1 and 2 Plasma Wave Instruments Micron-Sized Dust Particles Detected in the Outer Solar System by the Voyager 1 and 2 Plasma Wave Instruments

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nasa.reptv....g&link_type=abstract

Technical Report, NASA/CR-97-207155; NAS 1.26:207155; U-of-Iowa-97-3 Dept. of Physics and Astronomy

Astronomy and Astrophysics

Astronomy

Voyager 1 Spacecraft, Voyager 2 Spacecraft, Plasma Waves, Cosmic Dust, Interstellar Matter, Interplanetary Medium, Microparticles, Gas Giant Planets, Solar System, Ulysses Mission, Asteroids, Planets

Scientific paper

During the Voyager 1 and 2 flybys of the outer planets it has been demonstrated that the plasma wave instrument can detect small dust particles striking the spacecraft. In this paper, we examine the Voyager plasma wave data for dust impacts in the interplanetary medium at heliocentric radial distances ranging from 6 to 60 astronomical units (AU). The results show that a small but persistent level of dust impacts exists out to at least 30 to 50 AU. The average number density of these particles is about 2 x 10-8/cu m, and the average mass of the impacting particles is believed to be a few times 10-11 g, which corresponds to particle diameters in the micron range. Possible sources of these particles are planets, moons, asteroids, comets, and the interstellar medium. Of these, comets appear to be the most likely source. The number densities are only weakly dependent on ecliptic latitude, which indicates that the particles probably do not originate from planets, moons, or asteroids. Comparisons with interstellar dust fluxes measured in the inner regions of the solar system by the Ulysses spacecraft indicate that the particles are not of interstellar origin.

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