Abstract
The Richardson criterion ( R i ), which is a measure of the presence or absence of turbulence, has been calculated from measurements taken during and after a ‘winter anomaly’. The results indicate that during the anomaly, the atmosphere is fairly stable ( R i > 1) from 60 km up to about 78 km but between 78 and 90 km, in the same altitude range where the electron density is seen to be most enhanced, the atmosphere is turbulent as defined by the condition R i < 1. This contrasts with the normal day, where the condition for the existence of turbulence extends over the entire altitude range from 68 to 86 km.
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