Amplitude Variations of 15-GHz Radio Waves Transmitted Through Clear Air And Through Rain


  • A. W. Straiton,

  • C. R. Bailey,

  • W. Vogel


This paper describes point-to-point and radar return attenuation measurements through the atmosphere at a frequency of 15.3 GHz. Clear air fluctuations along a 20-km path were <1.5 db except in unusual situations, such as during a frontal passage or for a strong ground moisture layer occurring just before sunrise. Observations of a general rain showed an attenuation rain rate ratio of 0.1 db/km/mm/hr. Radar observations of a more intense shower showed a relatively small attenuation because of the limited extent of the rain cell.