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The low-frequency (Rayleigh-Jeans) spectrum of the cosmic background radiation (CBR) is expected to contain information relevant to the physical processes that occurred in the early universe. In this paper, the authors have measured the temperature of the cosmic background radiation (CBR) at a frequency of 3.8 GHz (7.9 cm wavelength), during two consecutive summers, obtaining a brightness temperature, T{sub CBR}, of 2.56 {plus minus} 0.08 K in 1987 and 2.71 {plus minus} 0.07 K in 1988 (68% confidence level). The new results are in agreement with their previous measurement at 3.7 GHz obtained in 1986 and have smaller error bars. Combining measurements from all 3 years, they obtain T{sub CBR} = 2.64 {plus minus} 0.07 K.

The temperature of the cosmic background radiation - Results from the 1987 and 1988 measurements at 3.8 GHz