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Particle erosion mechanisms and mass redistribution in Saturn's ringsA variety of physical processes can erode the surfaces of planetary ring particles. According to current estimates, the most efficient of these over the bulk of Saturn's rings is hypervelocity impact by 100 microns to one centimeter radius meteoroids. The atoms, molecules, and fragments ejected from ring particles by erosion arc across the rings along elliptical orbits to produce a tenuous halo of solid ejecta and an extensive gaseous atmosphere. Continuous exchange of ejecta between different ring regions can lead to net radial transport of mass and angular momentum. The equations governing this ballistic transport process are presented and discussed. Both numerical and analytic studies of idealized ring systems illustrate that ballistic transport can cause significant mass redistribution in the rings, especially near regions of high density contrast, such as the inner edges of the A and B rings. Ejecta exchanges can also alter local particle sizes and compositions and may produce pulverized regoliths at least several centimeters deep. The meteoroid erosion rate is so high that significant global torques and mass loss are possible on times shorter than a solar system life time.
Document ID
19850049652
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Durisen, R. H.
(Indiana University Bloomington, IN, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Advances in Space Research
Volume: 4
Issue: 9 19
ISSN: 0273-1177
Subject Category
Lunar And Planetary Exploration
Accession Number
85A31803
Funding Number(s)
CONTRACT_GRANT: NCA2-IR-335-401
Distribution Limits
Public
Copyright
Other

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