from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The study of atmospherics, especially through the use of electronic detectors.
- n. See atmospherics.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Electromagnetic pulses caused by atmospheric phenomena, such as lightning. Plural form of sferic.
- n. Radio interference caused by sferics; atmospherics.
Through a specially developed tweeter beam the high tone sound wave is projected to the ceiling inside the black cube where it reflects as sound figures and low red electromagnetic waves (as "whistlers" and "cracklers"), sferics and red luminous flashes.
An underground receiver could perhaps be built capable of detecting sferics from lightning bolts hitting the surface hundreds of miles away.
There a three sources of click-like interference: switching relais, electrostatic discharges caused by snow drift, and sferics produced by thunderstorms ten thousands of kilometers away.