Groundbased Io [O I] 6300 Angstroms Observations

Details Groundbased Io [O I] 6300 Angstroms Observations Groundbased Io [O I] 6300 Angstroms Observations

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.1507o&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #15.07; Bulletin of the American Astronomical Society, Vol. 31, p.848

Astronomy and Astrophysics

Astronomy

Scientific paper

In a continuation of our long-term Io monitoring campaign, high-resolution (lambda /Delta lambda =~ 120000) spectroscopic observations of the neutral oxygen 6300 Angstroms 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 x 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] 6300 Angstroms 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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