Physics
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11508219g&link_type=abstract
Journal of Geophysical Research, Volume 115, Issue A8, CiteID A08219
Physics
9
Planetary Sciences: Solar System Objects: Saturn, Planetary Sciences: Fluid Planets: Aurorae, Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Magnetospheric Physics: Energetic Particles: Precipitating, Magnetospheric Physics: Auroral Phenomena (2407)
Scientific paper
Ultraviolet Hubble Space Telescope images reveal a faint but distinct auroral emission equatorward of the main ring of emission of Saturn's southern polar region. This outer auroral emission is only visible near the nightside limb for the strongly tilted viewing geometry achieved in January 2004. We model the limb-brightening amplification of this emission, and we show that the observations are compatible with an ˜7° wide emission ring approximately centered on the 67°S parallel. The 1.7 kR brightness of this emission requires an injected electron energy flux of ˜0.3 mW m-2. The outer auroral emission maps to a region of the equatorial plane between 4 and 11 RS. We suggest that a population of suprathermal electrons observed by Cassini can provide more than the required energy flux without the need for field-aligned acceleration. This auroral UV emission may also be associated with energetic neutral oxygen and hydrogen atoms originating from the energetic protons and O+ of magnetosphere and/or with a secondary infrared auroral oval.
Bonfond Bertrand
Gérard Jean-Claude
Grodent Denis
Radioti Aikaterini
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