Abstract
The concentration of minor constituents which are required to produce the winter ‘anomaly’ of midlatitude radio wave absorption are evaluated. Between 85 and 100 km increases above presently measured values are by a factor of 30–150 for nitric oxide or ~10 3 for metastable oxygen ( O 2( 1Δ g ). Nitric oxide transported from the auroral zone has been suggested as a possible source of minor constituent; such a process would require ratios there of n(NO) n( 2 ) > 0.1 near 115km. The January 1963 stratospheric warmings and associated ionospheric and thermospheric (90–100 km) changes are consistent with this hypothesis.
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