Q: What Is Natural Radio?
A: Natural VLF (very-low-frequency) Radio - also called "Natural Radio" - are audio-frequency radio signals of Earth in the approximately 200 Hz to beyond 10,000 Hz (10 kHz) spectrum which are not man-made but occur naturally in nature. The most-spectacular phenomena are heard between 400 Hz and 5 kHz. Go to this website all about it with other sound clips:
http://www.auroralchorus.com/natradio.htm
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