CONTENTS

Policy on Intellectual Property Right (IPR)
�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
������� 4.1���� Radio noise due to the Earth�s atmosphere for earth stations
������� 4.2���� Radio noise due to the Earth�s atmosphere and the Earth�s surface for space stations
�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