The Density Dependent Ionization Balance of Carbon,Oxygen and Neon in the Solar Atmosphere

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Abstract
Density dependent ionization equilibria for carbon, oxygen and neon ions in the optically thin solar atmosphere are calculated. All relevant processes are included and the results are expected to be accurate to ~ 40 per cent. Excepting for the neutral and first ionized ions in each case, the results are applicable to the ionization equilibrium in any thermal plasma where the ionization is maintained by the free electrons. Fractional ion abundances on incorporating a chromosphere and corona model are also presented.