  We have used the two IRAS redshift surveys, 1.2-Jy (Fisher et al 1995) and
PSCz (Saunders et al 2000), to model the linear velocity fields within a
redshift of 8,000 km/s and have compared them in redshift space. The two
velocity fields only differ significantly in their monopole components. The
monopole discrepancy cannot be solely ascribed to shot-noise errors and
incomplete sky coverage. The mismatch seems to arise from incompleteness of the
PSCz catalog at fluxes $\le$ 1.2 Jy. The 1.2-Jy and PSCz higher order velocity
multipoles, particularly the dipole and quadrupole components, appear to be
consistent, suggesting that the dipole residuals found by Davis, Nusser and
Willick (1996) when comparing 1.2-Jy and MarkIII velocity fields probably
originates from the MarkIII velocities calibration procedure rather than from
uncertainties in the model velocity field. Our results illustrate the
efficiency of the spherical harmonics decomposition techniques in detecting
possible differences between real and model velocity fields. Similar analyses
shall prove to be very useful in the future to test the reliability of next
generation model velocity fields derived from new redshift catalogs like 2dFGRS
(Colless et al 2001), SDSS (York et al 2000), 6dF and 2MRS.
