THE HALL'S AND COWLING'S CURRENTS CONTRIBUTION INTO THE WESTWARD AURORAL ELECTROJET DURING SUBSTORM UNLOADING PHASE

We estimsted the Hall and Cowling current-caused contributions into the westward auroral electrojet (AEJ-W) during the substorm expansion phase, using data of two substorms. Between other, the data of field-aligned currents (FAC) were used, which were not available in past. As the main result, the major contributions in the unloading AEJ-W were caused by the Hall current that contradict to the conventional model. The physics behind this result is briefly discussed.