Steady-state model of the D-region during the February 1979 eclipse

Physics

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Atmospheric Models, D Region, Electron Precipitation, Ionospheric Ion Density, Solar Eclipses, Solar Terrestrial Interactions, Carbon Dioxide, Negative Ions, Nitric Oxide, Positive Ions

Scientific paper

Significant electron precipitation of sufficiently stable duration permitted the use of a steady-state model for the description of the charged particle distributions in the D-region during the eclipse of 26 February 1979. For the positive ions, the current results support conclusions reached in conjunction with the SPE-disturbed D-region of November 1969. Again, the three-body process leading to the clustering of NO(+) with CO2 is determined to be the principal loss mechanism for NO(+) ions below 80 km. Inexplicably, the loss of NO(+) by clustering with N2 is only of equal importance, at most. Carbon dioxide apparently is an important agent in hastening the formation of the heavier oxonium ions, H7O3(+) and H9O4(+). There was some evidence for this fact from the SPE also, but analysis of the current data is more conclusive. A number of minor positive ions have been modelled with fair success. Difference between the model and the data are discussed. There is some agreement between the model and the negative ion data. However, the measurements by both the AFGL and the Bern University groups indicate a layer of heavy negative ions, peaking near 82 km, which suggests an origin separate from gas-phase chemistry.

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