The sulfur emission and periodicity of the Jupiter plasma torus in 1988

Details The sulfur emission and periodicity of the Jupiter plasma torus in 1988 The sulfur emission and periodicity of the Jupiter plasma torus in 1988

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt.........2w&link_type=abstract

Ph.D. Thesis Wisconsin Univ., Madison.

Computer Science

3

Io, Periodic Variations, Satellite Surfaces, Space Plasmas, Sulfur, Toroidal Plasmas, Charge Exchange, Electron Density (Concentration), Fabry-Perot Interferometers, Ion Temperature, Jupiter (Planet), Line Spectra, Planetary Magnetic Fields, Planetary Rotation, Positive Ions

Scientific paper

In November and December 1988, observations were made of (S II) lambda 6716, 6731 and (S III) 9531 emissions from the Io plasma torus at Kitt Peak National Observatory with a Fabry-Perot interferometer. A total of 231 line spectra, 6 broadband images, and 3 spectrally resolved image sequences, or 'datacubes', were obtained during a six week period. A thorough periodogram analysis of the scan intensities revealed a strong periodicity in intensity fluctuations at 10.14 plus or minus 0.03 (1-sigma) hours, the most precise determination of subcorotational periodicity in the Io plasma torus to date. If the corotational lag is attributed to 'mass-loading', it can be inferred that approximately 55 percent of the torus' mass is injected by charge exchange, and therefore that the total mass injection rate is approximately 2.3 x 1030 AMU/s. A weak second periodicity at 9.925 hours (Jupiter's rotation period) cannot be excluded, but is not statistically compelling. The proposed 'System IV' period of 10.225 hours has been excluded. An extension of the Lomb-Scargle periodogram that permits the use of unequally weighted data was developed for this analysis. Average S(+) ion temperatures, determined from line widths, were never less than 105 K, and were usually three to seven times that amount. No correlation with intensity was found. Using a datacube, ion temperatures were determined both parallel and perpendicular to the Jovian magnetic field simultaneously, and were found to be the same. From the intensity ratio of the (S II) doublet, the electron density was determined to be 1500 plus or minus 400 cm-3; it varied little throughout the run. A determination and measurement of differential rotation between parts of the torus was attempted with the datacubes: an indication of slower rotation beyond 6 R4 was found, but it was not statistically significant. An intensity asymmetry in (S II) lambda 6731 between west and east ansae of 1.18 plus or minus 0.07 was found; no such symmetry existed in ion temperature. All six broadband images, including the three in (S III) lambda 9531, showed the majority of the emission originating from inside Io's orbit.

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