Measurements of sky noise temperature at a frequency of 6.0 kmc have been made for various conditions of absolute humidity and precipitation. For an antenna beam position 5° above the horizon, the sky noise temperature was found to increase about 15°K from winter to summer due to the change in absolute humidity. During periods of rain, with the antenna beam pointed to the zenith, sky noise temperatures as high as 130°K have been observed, compared with the usual background value of 3° due to oxygen and water vapor. Theoretical calculations of sky noise temperature for typical dry and humid summer days are presented.
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Hogg et al. (1961) studied this question.
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