Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.283..461c&link_type=abstract
Nature, vol. 283, Jan. 31, 1980, p. 461.
Astronomy and Astrophysics
Astronomy
19
Hydrogen Atoms, Land Ice, Photodissociation, Planetary Composition, Saturn Atmosphere, Saturn Rings, Emission Spectra, Rocket-Borne Instruments, Spectroscopic Analysis, Ultraviolet Astronomy, Ultraviolet Spectra, Saturn, Rings, Sputtering, Ice, Hydrogen, Ultraviolet, Spectroscopy, Clouds, Pioneer 11, Abundance, Models, Flux, Comparisons, Photodissociation, Brightness, Reflectivity, Collisions, Production Rate, Irradiation
Scientific paper
It is noted that rocketborne UV spectroscopic measurements have shown that a dense cloud on atomic hydrogen surrounds Saturn which has been interpreted as being associated with the Saturn ring system. Several ring sources of atomic hydrogen have been proposed, but abundance and lifetime estimates require a source which is much more potent than those previously considered. An alternate mechanism is proposed which satisfies this source requirement and involves photodissociation of surface water molecules on the icy ring material. The source rate for this mechanism is within a factor of two of the required value and is within the experimental error of the measurement.
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