Modeling the ion chemistry of the D region - A case study based upon the 1966 total solar eclipse

Details Modeling the ion chemistry of the D region - A case study based upon the 1966 total solar eclipse Modeling the ion chemistry of the D region - A case study based upon the 1966 total solar eclipse

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8610073s&link_type=abstract

Journal of Geophysical Research, vol. 86, Nov. 1, 1981, p. 10073-10086. Research supported by the U.S. Defense Nuclear Agency a

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2

Atmospheric Chemistry, D Region, Ionospheric Ion Density, Solar Eclipses, Anions, Electron Precipitation, Emission Spectra, Ionospheric Electron Density, Positive Ions, Vertical Distribution

Scientific paper

The results of a comparison of the predictive capabilities of the D region chemistry computer code known as DAIRCHEM with data obtained during the Nov. 12, 1966 solar eclipse are presented. It is found that: (1) the model provides a good fit to the measured electron density vs altitude for preeclipse undisturbed conditions; (2) the model prediction of total positive ion density in the 60-85 km altitude range is too low by a factor of two to five; (3) the rapid electron density reduction at second contact, at altitudes below 85 km, is not predicted by the model; and (4) especially near second contact, there are physical limitations on adjusting the reaction rates and processes within the model so that eclipse data can be fit. It is not clear whether discrepancies between measurement and prediction in the cases of positive ion density or temporal electron density behavior in the 60-90 km altitude range are due to the model's reaction chemistry or to other ionospheric physical processes not contained in the model.

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