Dj. Fixsen et al., COSMIC MICROWAVE BACKGROUND DIPOLE SPECTRUM MEASURED BY THE COBE FIRAS INSTRUMENT, The Astrophysical journal, 420(2), 1994, pp. 445-449
The FIRAS instrument on the COBE has determined the dipole spectrum of
the cosmic microwave background radiation (CMBR) from 2 to 20 cm(-1).
For each frequency the signal is decomposed by fitting to a monopole,
a dipole, and a Galactic template for similar to 60% of the sky. The
overall dipole spectrum fits the derivative of a Planck function with
an amplitude of 3.343+/-0.016 mK (95% confidence level), a temperature
of 2.714+/-0.022 K (95% confidence level), and an rms deviation of 6x
10(-9) ergs cm(-2) s(-1) sr(-1) cm limited by detector and cosmic-ray
noise. The monopole temperature is consistent with that determined by
direct measurement in the accompanying article by Mather et al.