资源环境科技发展态势分析平台

Subauroral Ion Drifts (SAIDs) are fast azimuthal plasma flows in the ionosphere. In this study, we use the Rice Convection Model to simulate an extremely intense SAID event which may trigger atmospheric emission phenomenon by specifying consecutive low-entropy bubble injections. The results show strong SAID flow faster than ∼5000 m/s that lasts longer than 100 minutes. Our model indicates that SAIDs map to the sharp inner edge of a strongly enhanced partial ring current, which connects to a Region-2 downward field-aligned current (FAC). The simulation predicts that the peak of the SAIDs, the center of the downward FAC, the subauroral boundary, the plasmapause, the inner edge of the proton and electron partial ring current and the maximum azimuthal drift in the magnetosphere are pressed tightly within 0.5° latitude or 0.2 Re in the equatorial plane.