Seasonal and solar cycle variation of E‐region nitric oxide

Measured electron density and [NO$sup +$]/[O$sub 2$$sup +$] data are used to deduce the seasonal and solar activity variation of E-region nitric oxide concentration. The results imply a strong dependence of [NO] on soft X rays leading to the possibility that dissociation of N$sub 2$ by energetic photoelectrons is a major source of N($sup 2$D). Seasonal variations of the thermosphere apparently cause enhanced [NO] in summer in agreement with the summer enhancement of experimental [NO$sup +$]/[O$sub 2$$sup +$]. (auth)

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