Neutral Sulfur Emission from the Io Torus Measured with the Hopkins Ultraviolet Telescope

Details Neutral Sulfur Emission from the Io Torus Measured with the Hopkins Ultraviolet Telescope Neutral Sulfur Emission from the Io Torus Measured with the Hopkins Ultraviolet Telescope

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447..408d&link_type=abstract

Astrophysical Journal v.447, p.408

Astronomy and Astrophysics

Astronomy

14

Planets And Satellites: Individual Io, Ultraviolet: Solar System

Scientific paper

During the Astro 1 mission in 1990 December, ultraviolet spectra of the Io plasma torus were obtained using the Hopkins Ultraviolet Telescope. These spectra cover a wavelength range of 830-1860 Å in first order and 415-930 Å in second order. Two separate observations were made. Observation 1, which nominally contained Io within the aperture, centered a 17" x 116" aperture on the west ansa of the torus, while observation 2, which excluded Io, centered a 9"4 x 116" aperture on the east ansa. Emission from the S I λ1479 multiplet is detected in both observations. The spectral width of this emission in observation 1 is too broad to be completely associated with Io. The best-fit is obtained with a narrow (3.0 Å) emission associated with Io and a broad (6.1 Å) emission associated with the torus. The derived emission rate from Io is consistent with IUE observations of Io and shows that only ˜33% of the S I emission measured by HUT can be accounted for as emission from Io. The rest of this emission is due to a diffuse neutral sulfur component of the torus. The detection of S I emission in observation 2 sets a lower limit to the angular extent of the neutral sulfur component of the torus to at least 20° in front of Io. Emission from the S I λ1429 multiplet is also detected in observation 1 and marginally detected in observation 2. Emission from the S I λ1814 multiplet was not detected in either observation but the derived upper limits are consistent with the expected flux based on the IUE measurements of Io. Observation 1 also shows emission from the S I λ1389 multiplet and a strong narrow line at 1398.7 Å, which is tentatively identified with the S I λ1405 multiplet. The λ1389 and λ1405 emissions are not present in observation 2. A comparison of S I multiplet emission ratios from Io with laboratory results does not support either e + S or e + SO2 as the excitation mechanism for neutral sulfur emission from Io.

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