Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4..219t&link_type=abstract
Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences, vol. 4, June 1986, p. 219-227.
Physics
9
D Region, Ionospheric Electron Density, Negative Ions, Height, Hydrogen Atoms, Oxygen Atoms, Ozone, Pair Production, Photodissociation, Photoionization, Solar Radiation
Scientific paper
A negative-ion model, based on gas-phase reactions, is used to study the detachment processes responsible for increases of electron concentrations observed in the lower D-region between nighttime and ground sunrise, before the arrival of ionizing solar radiations. The height distributions of negative-ion species, electrons, and total positive ions are obtained from time-dependent solutions of the corresponding continuity equations which incorporate simultaneous solutions for the minor neutral constituents involved. These distributions are used to identify the roles of chemical reactions involving minor neutral constituents, photodissociation, and photodetachment processes for negative ions in determining the observed presunrise changes in electron concentrations. It is shown that processes involving CO3(-) ions control the onset of the pre-sunrise changes but that NO3(-) ions must be involved in the electron concentration increases observed below about 75 km nearer ground sunrise.
Bowman R. M.
Thomas Luc
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