Presented are the results derived from analyzing the data on sporadic formations in the ionospheric E-region (Es) over East Siberia for 1960-1996. The raw data were averaged in the 11-year window at subsequent sliding steps of 1 year. The main characteristics of Es as foreseen by the intructions on ionogram processing are considered. Also, a classification of the sporadic layers into standard mid-latitude types is taken into account, and the set of data is broken up into three seasons: winter, summer, and equinox. It is shown that the variations of parameters of all types of sporadic formations exhibit - depending on the particular season - a close linkage to solar and (or) geomagnetic activity. On the other hand, some of the parameters of sporadic features show a close dependence on the correlation coefficient between indices of solar and geomagnetic activity (in this paper, between aa-indices and Wolf numbers) calculated by the same method of averaging. It was found that the stronger is the dependence on the degree of linkage between them, and vice versa. Thus there emerged a possibility of introducing a new index to define the climatic dependence of a number of ionospheric E-region parameters, namely, the correlation coefficient between indices of solar and geomagnetic activity, based on the aforementioned technique. Conceivably it may also be applied for some parameters of the middle atmospere.