Measurement of anisotropy in the cosmic background radiation on a large angular scale at 33 GHz

Physics

Scientific paper

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Anisotropy, Background Radiation, Cosmic Rays, Radiation Measurement, Airborne Equipment, Angular Distribution, Data Acquisition, Microwave Radiometers, Statistical Analysis

Scientific paper

Results of a measurement of anisotropy in the 3 K cosmic background radiation on a large-angular-scale are presented. Observations were carried out with a dual-antenna microwave radiometer operating at 33 GHz (0.89 cm wavelength) flown on board a U-2 aircraft to 20-km altitude. In eleven flights, between December 1976 and May 1978, the radiometer measured differential intensity between pairs of directions distributed over most of the northern celestial hemisphere. The measurements show clear evidence of anisotropy that is readily interpreted as due to the motion of the earth relative to the sources of the radiation.

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