1. The noises in a radio receiver or randomly distributed white spots or bands on the screen of a television receiver: Atmospherics are caused by interferences from natural electromagnetic disturbances in the atmosphere and the study of such phenomena.
2. The moods or atmospheres; the ambiances: Fortunately, the atmospherics of the conference were friendlier than we had anticipated.
3. Unusual conditions in the atmosphere: Atmospherics are those caused by lightning, or the continuous short, sharp noises produced by a radio during these conditions.

Electromagnetic radiation produced by natural phenomenam such as lightning: Atmospherics are disturbances of electrical origin causing interference with communication in wireless telegraphy, television, etc.

Sferics are atmospheric conditions caused by electromagnetic upheavals, especially as they affect radio transmission