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- W3135896990 abstract "Abstract The present study combines Radio and Plasma Wave Science/Langmuir Probe and Ion and Neutral Mass Spectrometer data from Cassini’s last four orbits into Saturn’s lower ionosphere to constrain the effective recombination coefficient α 300 from measured number densities and electron temperatures at a reference electron temperature of 300 K. Previous studies have shown an influx of ring material causes a state of electron depletion due to grain charging, which will subsequently affect the ionospheric chemistry. The requirement to take grain charging into account limits the derivation of α 300 to upper limits. Assuming photochemical equilibrium and using an established method to calculate the electron production rate, we derive upper limits for α 300 of ≲ 3 × 10 −7 cm 3 s −1 for altitudes below 2000 km. This suggests that Saturn’s ionospheric positive ions are dominated by species with low recombination rate coefficients like HCO + . An ionosphere dominated by water group ions or complex hydrocarbons, as previously suggested, is incompatible with this result, as these species have recombination rate coefficients > 5 × 10 −7 cm 3 s −1 at an electron temperature of 300 K." @default.
- W3135896990 created "2021-03-15" @default.
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- W3135896990 date "2021-02-01" @default.
- W3135896990 modified "2023-09-26" @default.
- W3135896990 title "Constraining the Positive Ion Composition in Saturn’s Lower Ionosphere with the Effective Recombination Coefficient" @default.
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- W3135896990 doi "https://doi.org/10.3847/psj/abd6e9" @default.
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