New Horizons Alice Observations of Io's UV Atmospheric Emissions

Details New Horizons Alice Observations of Io's UV Atmospheric Emissions New Horizons Alice Observations of Io's UV Atmospheric Emissions

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p31b1527r&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P31B-1527

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[5405] Planetary Sciences: Solid Surface Planets / Atmospheres, [5408] Planetary Sciences: Solid Surface Planets / Aurorae And Airglow, [6218] Planetary Sciences: Solar System Objects / Jovian Satellites, [6219] Planetary Sciences: Solar System Objects / Io

Scientific paper

Io's UV auroral and airglow emissions were observed by the New Horizons Alice instrument in 2007 during the spacecraft's Jupiter encounter. Initial results reported by Retherford et al., Science, 2007 include analysis of auroral brightness variations upon eclipse ingress and egress that provide evidence for changes in the relative contribution of sublimation and volcanic sources in shadow and at night. We report here an additional set of twenty five Io observations obtained with Alice while the satellite was in sunlight at various solar phase angles and locations within the Io plasma torus. These data allow a statistically meaningful trending analysis to be performed to better understand diurnal atmospheric variability. Neutral atomic oxygen and neutral and ionized atomic sulfur emission brightnesses are determined after subtraction of background Io plasma torus emission features also present in the Alice data. We discuss our results with comparisons to numerous observations of Io's atmosphere obtained with HST/ACS, HST/STIS, and other instruments.

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