Airglow emission from Titan during eclipse

Physics

Scientific paper

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Scientific paper

In this study, we take advantage of Saturn's shadow during three eclipse events to provide a strong constraint on the plasma contribution to UV and visible emissions from Titan's upper atmosphere. Faint UV emissions were observed by the Cassini UVIS (Ultraviolet Imaging Spectrograph) instrument during one event. Energetic plasma impact is inferred to produce such emissions, but the emitted intensity is more than an order of magnitude below that stimulated by photons on the dayside. Images from the Cassini ISS (Imaging Science Subsystem) instrument either show no emission or sometimes a very faint (~1 Rayleigh/nm) and nearly uniform airglow between about 300 and 1000 km altitude, too deep to be from plasma interaction. The mechanism responsible for these emissions is unknown at this time. There is no evidence for auroral structures in the spatially-resolved ISS images.

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