Tangled, primordial cosmic magnetic fields create small rotational velocity perturbations on the last scattering surface (LSS) of the cosmic microwave background radiation (CMBR). For fields which redshift to a present value of B_0 = 3× 10^-9 Gauss, these vector modes are shown to generate polarization anisotropies of order 0.1μ K - 4 μ K on small angular scales ( 500 < l < 2000), assuming delta function or a power law spectra with n=-1. About 200 times larger signals result for n=2 spectra.

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... ike inflation generated, scalar modes, these signals are dominated by the odd parity, B-type polarization, which could help in their detection.