Figure 2
From: Relationship between the equatorial electrojet and global Sq currents at the dip equator region
Two-station method. (a) Traditional method to calculate the equatorial electrojet (EEJ) as the difference between geomagnetic components at two stations: one near the dip equator (TIR) and one at the off-dip equator location (ABG). (b) An example of a latitudinal profile of the Sq field simulated by the CM4 model at the Indian sector. The black dots indicate EUEL at TIR and ABG. Sq at the dip equator is estimated by normalizing EUEL at ABG to the dip equator, while the total current at the dip equator is estimated by normalizing EUEL at TIR to the dip equator. Normalized data are indicated by open diamonds. The EEJ is calculated by subtracting the normalized Sq from the normalized total current.