1. An electric current that moves in an ionized layer above the equator in the earth's upper atmosphere.
2. A narrow belt of intense electric current flowing through the lower ionosphere in the equatorial and polar regions which creates auroras.
3. A stream of electricity moving in the upper atmosphere around the equator and also in polar regions, where it produces auroras.

A strong current of electricity which flows through the auroral zone during a polar substorm.

A geomagnetic perturbation (confusion or disorder) lasting one to two hours, which tends to occur during a local post-midnight time.

The magnitude of the substorm is largest in the auroral zone and corresponds to an injection of charged particles from the magnetotail into the auroral oval.