Abstract
The solar activity variation of nitric oxide density at 90–130 km for mid-latitude daytime condition has been examined on the basis of presently known ion-neutral chemistry of odd nitrogens and laboratory measured reaction rates along with transport mechanisms due to eddy and molecular diffusions. Since branching ratios of the reactions leading to the formation of N( 4S) and N( 2D) are not well established in the laboratory, three model combinations with different amounts of yield of N( 2D) have been considered. It is seen that while nitric oxide increases by factors of 3 to 4 at lower heights in all the models, at higher heights the variation with solar activity is sensitive to the type of model adopted. It is also seen that all three models reproduce the observed electron densities fairly well, but none of the models are able to explain the observed [NO +] [O 2 +] ratio and its variation with solar activity.
Published Version
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