Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.291..638a&link_type=abstract
Nature, Volume 291, Issue 5817, pp. 638-640 (1981).
Physics
4
Scientific paper
The presence of gaseous metal oxides and hydroxides originating from incoming meteoric material has been suggested to explain stratospheric ion composition1 and as chemical sinks for chlorine species2. Recent ion composition data can be explained without recourse to metal hydroxides3-5, although the results do not preclude gaseous metal compound concentrations of 104 cm-3 at 35 km. However, theoretical considerations suggest that gaseous meteoric material coagulates to form particulate matter6. No direct measurements of metal compounds exist. Photoionization of meteoric compounds such as NaOH and CaOH in the 40-70-km altitude region produces a diurnally varying source of ionization in addition to nearly constant cosmic ray ionization. Ion pair production can be several times that due to cosmic radiation depending on sunspot cycle, altitude, time of day and meteor activity. It is suggested here that the behaviour of the ion density should be studied to determine the existence of gaseous metal oxides. The available ion density and conductivity data are insufficient to demonstrate conclusively the existence of such compounds, although unexplained increases are observed. The presence of meteoric compounds, would imply an electrical conductivity which is related to both solar and meteor activity and would thus be an important factor in the physical processes involved in those Sun-weather relationships which depend on atmospheric electrical conductivity.
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