Dust on the Outskirts of the Jovian System: What Might Galileo and Cassini See?

Details Dust on the Outskirts of the Jovian System: What Might Galileo and Cassini See? Dust on the Outskirts of the Jovian System: What Might Galileo and Cassini See?

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.6527w&link_type=abstract

American Astronomical Society, DPS Meeting #32, #65.27; Bulletin of the American Astronomical Society, Vol. 32, p.1644

Astronomy and Astrophysics

Astronomy

Scientific paper

The outer region of the jovian system beyond ~ 100 jovian radii might be a host of a retrograde dust population. Four outer tiny moons are orbiting Jupiter in retrograde orbits. These moons are subject to micrometeoroidal bombardment by interplanetary dust particles. Hypervelocity impacts create ejecta that are widely distributed in the circumjovian space. Submicrometer-sized grains are rapidly lost from the system due to the strong radiation pressure perturbations. Micrometer-sized particles form a huge halo bounded by the orbits of the source moons. Their number densities are less than those of the interplanetary dust background in that region, and they are not expected to contribute to the Galileo and Cassini dust detector datasets. However, larger ejecta, ~ 10 μm in radius, keep confined to a torus-shaped cloud interior to the orbits of the parent moons, and they may dominate the number densities in this size regime over the interplanetary dust grains. Interestingly, the like-sized ejecta from the prograde outer moons are more vulnerable to the radiation pressure and are swept away from the system. We discuss the possibility for the dust detectors onboard Galileo and Cassini to detect the outer retrograde dust population.

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