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Modeling Cassini UVIS Interplanetary Hydrogen Lyα Observations from 1999 to 2017

Pryor, Wayne R.; Esposito, Larry W.; Gladstone, G. Randall +3 more

The Cassini Orbiter Ultraviolet Imaging Spectrograph (UVIS) obtained interplanetary hydrogen Lyα observations from 1999 to 2017, with mid-2004 to 2017 observations obtained from Saturn orbit. During its Saturn orbital phase, the spacecraft moved from mostly downwind and sidewind in the heliosphere to upwind. We analyze the full set of observations…