Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319l..33b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. L33-L38.
Astronomy and Astrophysics
Astronomy
44
Emission Spectra, Io, Neutral Gases, Oxygen, Sulfur, Ultraviolet Spectra, Iue, Jupiter Satellites, Spaceborne Astronomy, Jupiter, Neutral Particles, Oxygen, Sulfur, Emissions, Satellites, Io, Iue Satellite, Satellite Observations, Source, Origin, Spectra, Density, Electrons, Temperature, Plasma Torus, Atmosphere, Ultraviolet, Flux, Wavelengths, Brightness, Optical Properties, Thickness
Scientific paper
Two very long IUE exposures obtained with precise control of the spacecraft pointing show emissions due to neutral oxygen and sulfur near Io. The emitting region is centered on Io and is less than five Io diameters across. The two spectra obtained near eastern and western elongation in 1986 July and October, respectively, are similar, independent of whether the downstream or upstream side of the torus plasma flow past Io was viewed. If the spectra were produced solely by electron impact on O and S, the effective electron temperature is low (<2 eV), and large O and S densities are required. Electron impact on SO2 could contribute substantially to the observed spectra.
Ballester Gilda E.
Bertaux Jean Loup
Feldman Paul D.
Festou Michael C.
Lieske Jay H.
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