A radio atmospheric signal or sferic (sometimes also spelled "spheric") is a broadband electromagnetic impulse that occurs as a result of natural atmospheric lightning discharges.

Sferics can turn any AM radio into a simple lightning detection device. They are easily distinguished from normal static in that they are sudden loud, crackling noises, sounding a little like someone wringing a wad of plastic bubble wrap. They occur simultaneously with …

Sferics, short for "atmospherics", are the impulsive signals emitted by lightning. The frequency range is from a few hertz to millions of hertz. The part of this range that we can hear (the audio range) has frequencies up to about 15 thousand hertz (15 kHz).

Sferics: Sferics, short for "atmospherics", are impulsive signals emitted by lightning. They sound like twigs snapping or bacon frying. Sferics are caused by lightning strokes within a thousand kilometers or so of the receiver.

2013年8月6日 · The properties of sferics (the electric and magnetic fields generated by electrified clouds and lightning flashes) are briefly surveyed; the source disturbance and the influence of propagation being examined. Methods of observing sferics …

The properties of sferics--the electric and magnetic fields generated by electri-fied clouds and lightning flashes--are briefly surveyed, the source disturbance and the influence of propagation being ex-amined. Methods of observing sferics and …

Lightning strikes generate bursts of radio waves known as radio atmospherics, or sferics, which last only a few milliseconds but can travel for thousands of kilometres in the wave guide formed by the Earth and ionosphere. Sferics typically have frequencies in the Very Low Frequency (VLF) range of 0.1-10 kHz.

2017年11月6日 · The general term for these signals is sferics, from “atmospherics,” and are mostly generated by the 1.3 million lightning bolts discharged into the atmosphere every day. These discharges generate...

2013年5月23日 · [2] Lightning produces powerful, broadband radio waves called radio atmospherics, or just sferics, which propagate in the Earth-ionosphere waveguide and can be observed thousands of kilometers from the source.

2016年6月30日 · If humans had radio antennas instead of ears, we would hear a remarkable symphony of strange noises coming from our own planet. Scientists call them "tweeks," "whistlers" and "sferics."