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Flux estimates of ions from the lunar exosphere
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Flux estimates of ions from the lunar exosphere
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Journal Article
Flux estimates of ions from the lunar exosphere
2012
Overview
We compare estimates for the ion fluxes of twelve expected constituents of the lunar exosphere with estimates for the ion fluxes ejected from the lunar surface by solar wind ions and electrons. Our estimates demonstrate that measurements of lunar ions will help constrain the abundances of many undetected species in the lunar exosphere, particularly Al and Si, because the expected ion flux levels from the exosphere exceed those from the surface. To correctly infer the relative abundances of exospheric ions and neutrals from Kaguya Ion Mass Analyzer (IMA) measurements, we must take into account the velocity distributions of local ions. The predicted spectrum underestimates the measured levels of O+ relative to other lunar ion species, a result that may suggest contributions by molecular ions to the measured O+ rates. Key Points Fluxes of ions from the lunar exosphere can exceed fluxes of ions from surface We could infer abundances of undetected lunar neutrals from ion measurements Different exo‐ions map into Kaguya Mass Analyzer with different efficiencies
Publisher
Blackwell Publishing Ltd,American Geophysical Union
Subject
