Daytime nitric oxide at the base of the thermosphere

Physics

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Daytime, Ionospheric Composition, Nitric Oxide, Thermosphere, Annual Variations, D Region, Diurnal Variations, Molecular Ions, Solar Activity Effects

Scientific paper

Nitric oxide (NO) profiles are deduced from the analysis of ten daytime ion composition experiments performed at various latitudes, seasons, and solar conditions, principally over an altitude region from 85 to 100 km. Within a factor of 3, NO concentrations are found to vary from 100,000,000/cu cm at 100 km to 2,000,000/cu cm at 85 km for various sunspot numbers and seasons, except winter. This strong gradient suggests a vertical eddy diffusion coefficient on the lower side of those thought to be appropriate. The three winter midlatitude data sets, all associated with anomalous D region radio absorption, yield higher NO concentrations, two profiles attaining peak values of 1 billion/cu cm.

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