RECOMMENDATION
ITU-R P.372-9
Radio noise
Scope
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 17
7 Atmospheric
noise due to lightning
8 The combination
of noises from several sources