Abstract
The various chemical and photo-chemical processes leading to the production and loss of NO +, O 2 +, NO and N are considered to arrive at the diurnal variations of the number densities of these four constituents in the E- region at a time corresponding to sunspot minimum conditions. It is found that a large diurnal variation of the concentration of N exists and that measured values of relative ion abundances can be accounted for in terms of this variation. During the day, N is the minor constituent that is important in determining the relative ion abundance, whereas at night, NO is more important in the upper E- region. The calculated concentrations of N and NO are significantly less than those measured using rocket techniques.
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