COS-GTO: Imaging of Mid-UV Emissions from Io in Eclipse

The atmosphere and corona of Jupiter's volcanic moon Io emit light at a wide variety of wavelengths, from FUV neutral O and S lines to SO emission at 1.7 microns. These emissions provide important constraints on the distribution and chemistry of Io's atmosphere, and Io's interaction with the Jovian magnetosphere. The neutral O and S FUV emissions, shortward of 2000?, have been imaged extensively by HST/STIS and visible emissions {from neutral Na, K and O line emission, and SO2 continuum emission} have been imaged by the Galileo, Cassini, and New Horizons spacecraft, but the spatial distribution of emissions in the 2000-3000? region, thought to be dominated by SO2 electron impact continuum emission, has not yet been determined. Earlier long-slit observations with STIS indicated strong concentration of 2800? emission over the active volcano Prometheus {Jessup et al. 2004}, suggesting local volcanic control, but Cassini images suggest that the SO2 continuum seen at longe...