Cassini CAPS Identification of Pickup Ion Compositions at Rhea

  title={Cassini CAPS Identification of Pickup Ion Compositions at Rhea},
  author={Ravindra T. Desai and Shona A. Taylor and Leonardo H. Regoli and A. J. Coates and T. A. Nordheim and Martin A. Cordiner and Benjamin D Teolis and Michelle F. Thomsen and R. E. Johnson and G. H. Jones and Misa Cowee and J. H. Waite},
  journal={Geophysical Research Letters},
  pages={1704 - 1712}
Saturn's largest icy moon, Rhea, hosts a tenuous surface‐sputtered exosphere composed primarily of molecular oxygen and carbon dioxide. In this Letter, we examine Cassini Plasma Spectrometer velocity space distributions near Rhea and confirm that Cassini detected nongyrotropic fluxes of outflowing CO2+ during both the R1 and R1.5 encounters. Accounting for this nongyrotropy, we show that these possess comparable along‐track densities of ∼2 × 10−3 cm−3. Negatively charged pickup ions, also… 
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