Computer Science
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..307s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, March 1984, p. 307-312.
Computer Science
23
Atmospheric Composition, Iron, Magnesium, Metal Ions, Meteoritic Composition, Abundance, Diurnal Variations, Ion Distribution, Sodium
Scientific paper
Lidar observations of atmospheric sodium reveal a diurnally steady layer with a maximum concentration near 92 km of 3000-5000/cu cm. These data imply that both Fe and Mg should have peak concentrations near 100,000/cu cm on the basis of their relative abundance to sodium in chondritic meteorites. The available metallic-ion data below 100 km are reviewed, and typical maxima of 100/cu cm for Na and 1000/cu cm for both Fe(+) and Mg(+) are found for undisturbed daytime conditions. It is argued that enhancements of up to 10,000/cu cm for Fe(+) and Mg(+) during aurora support the viewpoint that Fe and Mg both approach 100,000/cu cm near 92 km. The lack of spectroscopic evidence for such concentrations is briefly discussed. Evidence for about a factor-of-ten diurnal variation on both Fe(+) and Mg(+) and probably Na(+) is found in the review of metal-ion data. Minimum concentrations of 100/cu cm are attained just before dawn for Fe(+) and Mg(+).
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