RECOMMENDATION ITU-R P.372-8 - Radio noise*
1 Sources of radio noise
2 Terms for the specification of noise intensity and their interrelationship
3 Noise levels as a function of frequency
4 Noise from atmospheric gases and the Earth's surface
5 Man-made noise
6 Brightness temperature due to extra-terrestrial sources
7 Atmospheric noise due to lightning
8 The combination of noises from several sources