A role of Cawling and Hall currents in creation of the westward auroral electrojet

In the conventional model, the westward auroral electrojet near midnight is created during substorm as the Cowling current in the channel of amplified ionospheric conductivity. The observed intensity AEJ-W Jw and the estimations of contributions from Cowling current J*cow within some time intervals, as well as from Hall current J*H within other ones are obtained in this work. The J*cow and J*H values have been calculated from data on observed longitudinal currents enveloped the AEJ-W. As deduced, the AEJ-W could be caused both by the Cowling current and by the Hall current. The latter case was observed even more often.