Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1909h&link_type=abstract
American Astronomical Society, DPS meeting #28, #19.09; Bulletin of the American Astronomical Society, Vol. 28, p.1129
Astronomy and Astrophysics
Astronomy
Scientific paper
About 700 hours of Voyager 1 ultraviolet spectrometer observations (both pre- and post-encounter) of H Lyman \alpha emissions from the vicinity of Saturn have been aggregated and analyzed. We included more observation time than previous analyses (\approx 2\times that of Shemansky and Hall, JGR 97, 4143, `92) because the emissions are faint and are superimposed onto a comparably luminous background. The analysis technique was a least-squares fit of density basis functions integrated along each observation's line of sight with degree of fit adjusted using singular value decomposition (SVD) of the fit matrix. Although the results are preliminary, we provisionally conclude that the atomic hydrogen density at a distance of \approx 2R_S from Saturn is on the order of 100cm^{-3} or more, falling off to a fraction of that value at \approx 10R_S before rising back up to \approx 100cm^{-3}$ or more near the orbit of Titan. This distribution suggests that both Titan and either the rings or atmosphere of Saturn are significant sources of atomic hydrogen for the magnetosphere.
Hall Doyle T.
Herbert Floyd
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