Abstract
The first pass of the Cassini probe in the vicinity of Saturn, above the E-ring, demonstrated a plasma consisting of water group ions (H +, O +, OH +, H 2O +) with a small N + ion component (3%). Using a simple model for the transport of magnetospheric ions, we show that the N + ions can be traced back to the Enceladus satellite. Such a result can be explained by the existence in this icy satellite, supposed to be still geologically active, of volatile components such as ammonia NH 3, or by the previous implantation of N + ions of external origin on its surface. To cite this article: M. Bouhram et al., C. R. Physique 6 (2005).
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