Modeling, Analysis, and Interpretation of Photoelectron Energy Spectra at Enceladus Observed by Cassini - Taylor,SA; Coates,AJ; Jones,GH; Wellbrock,A; Fazakerley,AN; Desai,RT; Caro-Carretero,R; Michiko,MW; Schippers,P; Waite,JH (JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2018)