Relationship between foF2 trends and geographic and geomagnetic coordinates

The possibility of presenting parameters k(foF2) and ΔfoF2 characterizing the change over time in the critical frequency of the ionospheric F2 layer in recent decades was considered. These parameters were previously obtained by the authors as functions of geographic coordinates, latitude and longitude. It was shown that there is such a possibility and the corresponding statistical significances of the obtained dependencies lie within the limits from ∼90% to more than 99%. Simultaneously, the dependence of the linear trend k on magnetic coordinates D and I was studied. This dependence should manifest the relation of the trends in foF2 to dynamical processes (horizontal winds) via the vertical drift induced by them and the corresponding change in the F2-layer height.