Groundbased Spectroscopy of the Io Plasma Torus During the June 1996 Galileo Torus Scan

Details Groundbased Spectroscopy of the Io Plasma Torus During the June 1996 Galileo Torus Scan Groundbased Spectroscopy of the Io Plasma Torus During the June 1996 Galileo Torus Scan

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2318b&link_type=abstract

American Astronomical Society, DPS meeting #28, #23.18; Bulletin of the American Astronomical Society, Vol. 28, p.1155

Astronomy and Astrophysics

Astronomy

Scientific paper

We conducted spectroscopic observation of emission from S+ and neutral sodium in the Io plasma torus over 12 nights in June of 1996, using the 0.6m Lick Observatory Coude Auxiliary Telescope coupled to the Hamilton Echelle Spectrograph. Spectra were taken with the slit aligned along the torus centrifugal equator for S+ observations and along the Io orbital plane for sodium. A neutral density filter masked much of the reflected light from Jupiter. Approximately 50 spectra of Na at {5890,5896 Angstroms} and 40 spectra of [SII] at {6716,6731 Angstroms} were analyzed to determine the present state of the torus. Intensities, velocities, and temperatures of the two species will be compared to their past properties in the torus determined using the same methods (Brown, JGR 100, '95, p.21683). System III and System IV longitudinal variations and the dawn-dusk brightness asymmetry will be discussed. This study is part of an ongoing study of variability in the plasma torus using the facilities at Lick Observatory. In addition, this study is part of a recent campaign of simultaneous observations by Galileo, HST, EUVE, and several ground-based observatories. This work has been supported by NASA's Planetary Astronomy Program.

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