A re‐examination of the mass budget of the ring exosphere of Saturn – as prompted by the most recent Cassini measurements in the vicinity of the ring system ‐ indicates that the corresponding number density could reach the level of 2–3 × 10 5 cm −3 at maximum. Such extended exospheric structure in equilibrium with a thin ring plasma disc could be an important supplier of suprathermal oxygen ions of a few tens of keV in the Saturnian magnetosphere.
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W.‐H. Ip (2005) studied this question.
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