Physics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..969h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, Oct. 1983, p. 969-972.
Physics
14
Io, Light Emission, Rotating Plasmas, Satellite Atmospheres, Space Plasmas, Sulfur, Density Distribution, Ion Production Rates, Planetary Rotation, Plasma Drift, Positive Ions, Jupiter, Satellites, Io, Longitude, Asymmetry, Plasma Torus, Source, Optical Properties, Brightness, Emissions, Ultraviolet, Wavelengths, Ionization, Sulfur, Ions, Corotation, Period, Drift, Mass Loading, Distribution, Calculations, Data, Hypotheses, Radial Transport
Scientific paper
Remote observations of the Io plasma torus have revealed a persistent longitudinal asymmetry in the brightness of optical S(+) emission lines but not of ultraviolet S(2+) emission lines. The S(+) asymmetry (with respect to the corotating System III coordinates) has been attributed to an asymmetric plasma source; the question then arises, why do the higher ionization states of sulfur not reflect a similar asymmetry? The explanation proposed here is based on the fact that torus ions do not quite corotate at the System III rate because of mass loading. If the resulting System III drift period of the ions is intermediate between the ionization lifetimes of S(+) and S(2+), then the asymmetry of the source will be obscured by longitudinal drift for the relatively long-lived multiply-ionized sulfur ions, but not for short-lived S(+).
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