Effects of Subauroral Polarization Streams on the Equatorial Electrojet During the Geomagnetic Storm on 1 June 2013: 2. The Temporal Variations

Using ground-based magnetic field measurements and numerical simulations from the Thermosphere-Ionosphere Electrodynamic General Circulation Model (TIEGCM), a first paper (Zhang, Yamazaki, et al., 2021, doi: https://doi.org/10.1029/2021JA029681; under review) introduced potential roles of disturbance dynamo electric due to subauroral polarization streams (SAPS) on equatorial electrojet (EEJ) during moderate geomagnetic storm 1 June 2013. Our second study investigated temporal responses SAPS. At noon, residual EEJ (?EEJ) owing SAPS flows westward, that is, counter (CEJ). The variation CEJ excited by was basically consistent with SAPS, effects zonal wind were larger than those meridional wind. relative time delay related propagation mid-latitudes low-latitudes. It took 2–3 hr for SAPS-related propagate region change polarity EEJ. influence winds variations ?EEJ is generation eastward currents at mid-latitudes, which can accumulate positive charges dusk terminator then generate westward lower latitudes.