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- W3204081856 abstract "<p>We combine RPWS/LP and INMS data from Cassini's Grand Finale orbits into Saturn's lower ionosphere to calculate the effective recombination coefficient &#945;<sub>300</sub> at a reference electron temperature of 300 K. Assuming photochemical equilibrium at altitudes below 2500 km and using an established method to determine the electron production rate, we derive upper limits for &#945;<sub>300</sub> of &#8764; 2.5&#8727;10<sup>-7</sup> cm<sup>3 </sup>s<sup>-1</sup>, which suggest that Saturn's ionospheric positive ions are dominated by species with low recombination rate coefficients.<br />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&#8727;10<sup>-7</sup> cm<sup>3 </sup>s<sup>-1</sup> at an electron temperature of 300 K. The results do not give constraints on the nature of the negative ions.</p>" @default.
- W3204081856 created "2021-10-11" @default.
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- W3204081856 date "2020-10-08" @default.
- W3204081856 modified "2023-09-26" @default.
- W3204081856 title "Using the effective recombination coefficient to constrain the positive ion composition in Saturn's ionosphere" @default.
- W3204081856 doi "https://doi.org/10.5194/epsc2020-451" @default.
- W3204081856 hasPublicationYear "2020" @default.
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