Physics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9718257s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. E11, p. 18,257-18,264.
Physics
32
Ion Implantation, Mercury Atmosphere, Mercury Surface, Metal Ions, Potassium, Sodium, Atmospheric Composition, Hydrogen Atoms, Oxygen Atoms, Regolith, Temperature Dependence
Scientific paper
An explanation is given for time-variable and spatially discrete enhancements of neutral sodium (Na) and potassium (K) in Mercury's atmosphere. Some locations of increased intensity can be explained in terms of sodium and potassium ion implantation into the surface regolith grains during the long, 88 Earth day, Mercurian night with subsequent diffusion to the atmosphere when the enriched surface of Mercury rotates into the intense sunlight of day. Support for the suggested mechanism is shown by the K data which show a marked morning/afternoon assymmetry and can be explained by time and temperature dependent degassing. The magnetospheric mechanism necessary for ion implantation is discussed as is the diffusion mechanism. Alternative source, recycling, and distribution processes are also discussed.
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