sferics

Etymology
From.

Noun

 * 1) Electromagnetic pulses caused by atmospheric phenomena, such as lightning.
 * 2) * 1920: Wilbur H. Paulsen (American Meteorological Society pub.), Bulletin of the American Meteorological Society
 * A Sferics Locating System has been developed to determine the geographical location of lightning strokes...
 * 1) * 1965 (pub.): Mitre Corporation, Research & Experimentation 1960-1964
 * ...an artificial sferics generator was used as a known source of EM pulses.
 * 1) * 1987: Barbara Tufty, 1001 Questions Answered About Hurricanes, Tornadoes and Other Natural Air Disasters
 * Researchers have thought that possibly these sferics could be used to track hurricanes—but so far, they have been only marginally successful.
 * 1) * 2003: Rakov, Vladimir A. Rakov, Martin A. Uman, Lightning: Physics and Effects
 * The second common theoretical approach of the propagation of sferics involves viewing the Earth-ionosphere cavity as a waveguide...
 * 1) Radio interference caused by sferics; atmospherics.
 * The second common theoretical approach of the propagation of sferics involves viewing the Earth-ionosphere cavity as a waveguide...
 * 1) Radio interference caused by sferics; atmospherics.

Usage notes
When referring to the electromagnetic phenomenon, this term can be used either as the normal plural of sferic or in pluralia tantum construction.