Equatorial electrojet

The equatorial electrojet (EEJ) is a narrow ribbon of current flowing eastward in the daytime equatorial region of the Earth's ionosphere, and one of three global electrojets. The abnormally large amplitude of variations in the horizontal components measured at equatorial geomagnetic observatories, as a result of EEJ, was noticed as early as 1920 from Huancayo geomagnetic observatory. Observations by radar, rockets, satellites, and geomagnetic observatories are used to study EEJ.

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