Forbidden S II images of the Io torus

Details Forbidden S II images of the Io torus Forbidden S II images of the Io torus

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..377p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 377-393.

Astronomy and Astrophysics

Astrophysics

22

Galilean Satellites, Io, Jupiter Atmosphere, Space Plasmas, Toruses, Earth Magnetosphere, Electron Energy, Forbidden Transitions, Green'S Functions, Natural Satellites, Solar Orbits, Jupiter, Satellites, Io, Torus, Imagery, Plasma, Brightness, Emissions, Longitude, Magnetic Properties, Corotation, Observations, Spectroscopy, Source, Charge, Electrical Properties, Density, Modles, Intensity, Electrons, Temperature, Distance, Geometry

Scientific paper

The authors report the results of a study of the Io plasma torus in which ≡90 images in the [S II] λ6731 line were acquired during two four-night intervals in 1981 March and April. The authors show that, in general, the brightness variations with longitude can be accounted for by the presence of two localized plasma source regions. They find support for the earlier conclusion drawn from ground-based data that the red [S II] emission is often brightest approximately in the active sector, and show that the region of strongest S II intensity modulation with magnetic longitude is essentially coincident with the region of brightest S III EUV emission. The possible effects of subcorotational velocities on ion density distributions in the torus are also investigated. Evidence is presented for east-west variations in the torus geometry. Finally, the pertinent geometrical aspects of the data are discussed.

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