CONTENTS

Policy on Intellectual Property Right (IPR)     ii
RECOMMENDATION  ITU-R  P.372-10     1
Radio noise     1
Scope     1
1 Sources of radio noise  1
2 Terms for the specification of noise intensity and their interrelationship  2
3 Noise levels as a function of frequency  4
4 Noise from atmospheric gases and the Earth�s surface  6
5 Man-made noise  12
6 Brightness temperature due to extra-terrestrial sources  16
7 Atmospheric noise due to lightning  23
8 The combination of noises from several sources  24