Inputs and outputs of the analytical model in forward mode (left) and inverse mode (right) for He+ and He2+ ion species. The “forward” mode uses the recommended water outgassing rate QS13 of Snodgrass et al. (2013) to calculate theoretical flux ratios RF. The “inverse” mode uses RPC-ICA observations of He+/He2+ particle flux ratios to derive the corresponding outgassing rates Qobs. nH2O is the number density of neutral species H2O, so here species A = H2O.
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