Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.1504r&link_type=abstract
American Astronomical Society, DPS meeting #39, #15.04; Bulletin of the American Astronomical Society, Vol. 39, p.437
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The New Horizons spacecraft observed Io's aurora in eclipse on four occasions during its flyby of Jupiter in Spring 2007. These aurora observations provide new information on the relative contribution of volcanos to Io's atmosphere and its interaction with Jupiter's magnetosphere. Long Range Reconnaissance Imager (LORRI) visible aurora imaging, Alice UV spectrometer light curves, Multispectral Visible Imaging Camera (MVIC), and concurrent Hubble Space Telescope Advanced Camera for Surveys (HST/ACS) FUV imaging in eclipse are reported. The results include: 1) small volcanic bright spot emissions indicate local atmospheric density enhancements and provide a way to determine their relative contribution to the global atmosphere, 2) auroral brightness variations upon ingress and egress are evidence for changes in the relative contribution of sublimation and volcanic sources in shadow, and 3) improved imaging of volcanic plume aurora enables advancements in detailed simulations of Io's electrodynamic interaction with the surrounding Io plasma torus.
Alan Stern S.
Bagenal Fran
Cheng Andrew F.
Gladstone Randall G.
Lopes Rosaly M.
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