Convection electric fields are observed with the European Incoherent Scatter Common Program CP-3 which probes the F2 region of the auroral ionosphere between 61¿ and 72¿ invariant latitude for 24-hour runs. Several examples of convection fields are discussed, corresponding to various levels of magnetospheric activity. The principal characteristics of the convection drifts are discussed in the light of indices of magnetospheric activity level. It is shown that depending on the level of magnetospheric activity as revealed by the Kp index, the two-cell convection pattern is more or less present in the field of view of the radar and that the convection velocities around dawn and dusk increase with increasing activity. A method is described which assumes that the 24-hour convection pattern is due to a steady state potential viewed by the radar rotating with the earth under its ionospheric induced structures; as this assumption can be wrong, in some extreme circumstances of very high and unsteady magnetospheric activity, a test is proposed to ascertain the validity of the method. Inferred potential distributions are then discussed; it is shown in particular that the potential drop from dawn to dusk increases with the magnetospheric activity index Kp. A preliminary analysis of the shapes and positions of the two convection cells is then presented.