An atmospheric discharge of electricity usually accompanied by thunder, which typically occurs during thunderstorms, and sometimes during volcanic eruptions or dust storms.


A radiofrequency electromagnetic signal generated by some lightning discharges.

The signal propagates along a geomagnetic line of force and often bounces several times between the Northern and Southern Hemispheres.

See also: Atmospheric Interference, Ball Lightning, Sferics Observation.

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Subjects: Meteorology