Extreme ultraviolet explorer satellite observation of Jupiter's Io plasma torus

Details Extreme ultraviolet explorer satellite observation of Jupiter's Io plasma torus Extreme ultraviolet explorer satellite observation of Jupiter's Io plasma torus

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...426l..51h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 426, no. 1, p. L51-L54

Astronomy and Astrophysics

Astronomy

41

Io, Jupiter (Planet), Space Plasmas, Spaceborne Astronomy, Toroidal Plasmas, Toruses, Ultraviolet Astronomy, Ultraviolet Spectra, Astronomical Spectroscopy, Asymmetry, Emission Spectra, Extreme Ultraviolet Explorer Satellite, Line Spectra, Spectrographs, Ultraviolet Spectroscopy

Scientific paper

We present the first Extreme Ultraviolet Explorer (EUVE) satellite observation of the Jupiter system, obtained during the 2 day period 1993 March 30 through April 1, which shows a rich emission-line spectrum from the Io plasma torus spanning wavelengths 370 to 735 A. The emission features correspond primarily to known multiplets of oxygen and sulfur ions, but a blended feature near 372 A is a plausible Na II transition. The summed detected energy flux of (7.2 +/- 0.2) x 10-11 ergs/sq cm(s) corresponds to a radiated power of approximately equal to 4 x 1011 W in this spectral range. All ansa emissions show a distinct dawn-dusk brightness asymmetry and the measured dusk/dawn ratio of the bright S III lambda-680 feature is 2.3 +/- 0.3, significantly larger than the ratio measured by the Voyager spacecraft ultraviolet (UV) instruments. A preliminary estimate of ion partitioning indicates that the oxygen/sulfur ion ratio is approximately equal to 2, compared to the value approximately equal to 1.3 measured by Voyager, and that (Na(+))/(e) greater than 0.01.

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