Large-Scale Anisotropy in the 2.7-K Radiation with a Balloon-Borne Maser Radiometer at 24.5 GHz

Observations with a high-sensitivity radiometer, covering 80% of the sky, give substantially improved measurements of anisotropy in the 2. 7-K radiation. The dipole effect is (Tₗ, Tₘ, Tₙ) = (-3. 070. 17, 0. 670. 09, -0. 450. 09) mK; the Earth's orbital motion through the 2. 7-K radiation is detected. No statistically significant quadrupole effect is seen, and a magnitude limit of 0. 19 mK is established at the 90% confidence level. Covariance analysis for angular separations between 10^ and 180^ gives 〈T₁T₂〉<0. 01 (mK) ^2.