AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 15. The Solar System
Display, Monday, May 31, 1999, 9:20am-6:30pm, Southeast Exhibit Hall

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[15.07] Groundbased Io [O I] 6300Å\ Observations

R.J. Oliversen (NASA/GSFC), F Scherb, F.L. Roesler, J. Corliss, R.C. Woodward (U Wisconsin), M.E. Freed (Raytheon ITSS), O.L. Lupie (CSC), W.H. Smyth (AER)

In a continuation of our long-term Io monitoring campaign, high-resolution (\lambda/\Delta\lambda ~q 120000) spectroscopic observations of the neutral oxygen 6300Å\ emission were obtained at the NSO McMath-Pierce main telescope in 1993-1994 and 1996 - 1998. The stellar spectrograph, equipped with an image slicer, had a 5.\!\!''2 \times 5.\!\!''2 field of view. Spectra with good signal-to-noise were obtained for a significant range of Io orbital and System~III longitudes. The data are examined for longitudinal and orbital phase relationships, east-west asymmetries, and long and short term temporal variability, and are compared to earlier results of Scherb and Smyth (1993,JGR,98,18729). An unexpected result is we find the [O~I] flux to be correlated with the emission Doppler width. In addition, we will discuss the October 1997 observations that were concurrent with HST/STIS ultraviolet Io observations by Roesler (U~Wisconsin) and Moos (JHU) (Roesler et al. 1999, Science,283,353). All ultraviolet O~I and S~I emission features and the [O~I] 6300Å\ integrated emission brightened simultaneously. Furthermore, we will describe the data base of all our groundbased [O I] observations and results. This work is funded in part by NASA grant NAG5-6787.

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