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Terrestrial Natural and Man-made EM Noise

By Cesidio Bianchi and Antonio Meloni

3. Natural Radio Noise

Non ionizing radiation (NIR) electromagnetic waves range from the mHz to 300 GHz spanning over 14 orders of magnitude (figure 2). The corresponding wavelengths range from length comparable with dimension of the solar system, for waves around the mHz frequencies, to millimeters for frequency around 300 GHz.

FIGURE 2 NIR frequency bands and the main natural radio noise sources NIR frequency bands and the main natural radio noise sources
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