Observations of Io's sodium cloud and torus

Details Observations of Io's sodium cloud and torus Observations of Io's sodium cloud and torus

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12..347j&link_type=abstract

(Planetary magnetospheric physics II; Proceedings of Symposium 5 and the Topical Meetings of the Interdisciplinary Scientific Co

Physics

2

Io, Sodium Vapor, Sulfur, Charge Coupled Devices, Fabry-Perot Interferometers, Jupiter Atmosphere

Scientific paper

The first results from a new observing program studying the Io plasma torus and neutral clouds are presented. Images of both Io's sodium cloud and its SII torus were obtained on 11 and 12 Dec. 1989 using a focal reducer CCD camera and a tunable Fabry-Perot filter. Masks were used allowing the study of both ansae of the torus simultaneously. The torus was inclined by 7.8(+/- 0.6) deg to the Jovian equatorial plane. The line ratio of the forbidden red doublet lines (6716A/6731A) was 0.95 (+/- 0.15). These results show that the torus conditions in Dec 1989 were significantly different from those at Voyager fly-by but may be similar to conditions observed in Mar. 1981 from the ground.

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