Other
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8825419o&link_type=abstract
Unknown
Other
Electron Energy, Io, Morphology, Satellite Imagery, Sulfur, Emission Spectra, Line Spectra, Ultraviolet Spectrometers, Voyager Project
Scientific paper
A Fabry-Perot spectrometer was used to obtain images of the Io torus in emission lines of S II (wavelength 6716 and 6731) and S III (wavelength 9531) in February and March 1981, on the 2.1 meter telescope at KPNO. The S II and S III images showed a large variation in brightness and radial extent. There is an indication the S II and S III emissions in the warm torus are correlated. The S II and S III emissions in the warm torus also have similar scale heights along the magnetic field lines of approximately 0.6 to 0.72 RJ. The east-west asymmetry in the S II images taken at similar magnetic longitudes, but 2.5 Jovian rotations apart, supports the theory of convective motions suggested by others. In addition to the images, simultaneous measurements of the S II (6731 wavelength) line profile were also made on one night using a Fabry-Perot scanning spectrometer on the 4 meter at KPNO. The S II spectral scans implied ion temperatures of 52 (+ or - 10) x 10 to the 3rd at 5.2 to 5.6 RJ from Jupiter and a minimum temperature of at least 3 x 10 to the 5th K at 6 RJ from Jupiter.
Oliversen Ronald James
Roesler Fred L.
Scherb Frank
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