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1] The effect detected earlier by L. B. Vanina and A. D. Danilov (2003) is discussed in detail. The effect is that a high enough and statistically significant negative correlation coefficient is observed between the near-noon and near-midnight values of the critical frequency f o F 2. In this paper, the peculiarities of the effect (dependence on season, solar and geomagnetic activity, and geomagnetic latitude) are considered in detail on the basis of the data of a few ionospheric stationsdoi:10.1029/2005gi000129 fatcat:w4d6nkdosbd3bpgnbgptpskgnm