Radiation is categorized as either non-ionizing or ionizing. Some natural radiation below 5 kHz results from pulsations in the earth's magnetosphere during intense solar storms causing the Aurora over one or both poles to light up.
Average rate of global lightning strikes is about 100 bolts per second.
Natural radiation below 5 kHz results from lightning. Man-made radiation dominates 50 Hz to 300 GHz. Most natural radiation of significance occurs in a small part of the lowermost frequency spectrum, electrostatic to about 5 kHz, and in the uppermost part of the spectrum above 10 THz or 10 12 Hz.
Natural radiation was the only source of human exposure until the latter part of the nineteenth century when Thomas Edison invented the electric light.
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