LAMBDA Graphics: CMB Solar Dipole Amplitude and Direction
The microwave dipole (ℓ = 1) anisotropy is attributed to the motion of the Solar system with respect to the rest frame of the CMB, and thus Doppler shifted CMB monopole radiation. Computation of the velocity vector is complicated by the presence of Galactic emission, and results have evolved with improvements in foreground removal techniques and instrumental sensitivity.
We show direction and amplitude of the dipole as computed from five separate determinations. Uncertainties (68% C.L.) are quoted as the quadrature sum of both statistical and systematic estimates, as provided in the references. Note that the COBE uncertainties in the table are 95% C.L., but 68% C.L. are used in the plots.
CMB Solar Dipole Amplitude
CMB Solar Dipole Direction