Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...62..389m&link_type=abstract
Icarus (ISSN 0019-1035), vol. 62, June 1985, p. 389-414.
Astronomy and Astrophysics
Astronomy
40
Astronomical Spectroscopy, Io, Line Spectra, Toroidal Plasmas, Forbidden Transitions, Oxygen, Plasma Density, Secular Variations, Spatial Distribution, Sulfur, Ultraviolet Spectra, Jupiter, Satellites, Io, Torus, Spectrography, Observations, Symmetry, Optical Properties, Emissions, Intensity, Diffusion, Longitude, Plasma, Density
Scientific paper
Spectroscopic measurements of lines from both forbidden S II and forbidden O II in the Io torus taken on 15 nights spread over four months in 1981 are presented and discussed. An east-west asymmetry was observed in the optical emissions, showing larger western intensities and a more diffuse and radially extensive nebula to the east. Two configurations of forbidden S II longitudinal asymmetry were stable over at least four days. Longitudinal structure was not detected in either the forbidden O II intensity or the plasma density as measured by the forbidden O II and S II doublet ratios. A radial variation in the ratio of O II/S II was observed, with the ratio being largest near Io's orbit. Monthly variability was detected in both the intensity and density of the torus.
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