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Thermal ion flow in Saturn's inner magnetosphere measured by the Cassini plasma spectrometer: A signature of the Enceladus torus?
Ist Teil von
Geophysical research letters, 2009-12, Vol.36 (23), p.np-n/a
Ort / Verlag
Washington, DC: Blackwell Publishing Ltd
Erscheinungsjahr
2009
Link zum Volltext
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
For the middle and outer magnetosphere of Saturn (>5.5 RS), Cassini plasma spectrometer ion counting data provides thermal ion moments by assuming Maxwellian phase space density distributions for each ion species. However, in the inner magnetosphere (<5.5 RS) within Saturn's extended neutral cloud and proposed Enceladus torus, there is fresh ion production via charge exchange, yielding a complex ion velocity distribution. In this study, ion flow velocities in the inner region are obtained using the assumption that the ion phase space distributions are gyrotropic. Significantly sub‐corotating ion flow velocities (∼75% of corotation) are found in the vicinity of the Enceladus orbit and the radial extent of the sub‐corotation is about 1.0 RS, in reasonable agreement with the simulated radial dimension of the Enceladus torus.