On the abundance of micron-sized particles in Saturn's A and B rings

Details On the abundance of micron-sized particles in Saturn's A and B rings On the abundance of micron-sized particles in Saturn's A and B rings

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a..85w&link_type=abstract

In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 85-88 (SEE N89-10682 01-89)

Physics

Optics

1

Iue, Particle Size Distribution, Saturn Rings, Spaceborne Astronomy, Ultraviolet Astronomy, Geometrical Optics, Ice, Mie Scattering

Scientific paper

A set of 12 IUE spectra of Saturn's rings was obtained between July 1982 and Feb. 1985. The large aperture was positioned on the Cassini division at the western ansa and the size of the aperture was such that the A and B rings contributed equally to the total area inside the aperture. The IUE data are complemented at wavelength below 1600 A by Voyager 2 UVS data. The most obvious feature of the combined spectrum, which covers the wavelength range from 500 to 3000 A, is the water ice absorption edge between 1650 and 1700 A. Three different modeling approaches were used to interpret the data: multiple Rayleigh scattering approximation for extremely small particles (r = 0.003 microns); single Mie scattering for power law size distributions (r = 0.01 to 40 microns); and Hapke geometrical optics approximation for very large ring particles (r larger than 100 microns). The most satisfactory fits can be obtained with the Mie scattering approach and the Hapke approximation. However, the available data are not sufficient to uniquely determine a particle size distribution.

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