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- During an auroral storm, intense electric currents flow in the ionosphere,
- causing geomagnetic disturbances. During such an event declination can vary by
- some degrees in a few minutes. The amplitude of the auroral currents can be as
- high as millions of amperes. It can be compared with currents in high voltage
- power systems, which are of the order of 500 amperes. The amount of energy is so
- high that momentarily it exceeds our energy consumption. Alas, ionospheric
- currents cannot be used as a direct energy source.
-
- Satellite images have demonstrated that the length of an arc may extend over
- 10,000 km and its width from 100 m to 10 km. The lower border of the arc is at
- an altitude of 100 to 110 km. A quiet arc may break up into an auroral storm in
- the midnight sector.
-