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Primordial tangled cosmological Magnetic Fields source rotational velocityperturbations of the baryon fluid, even in the post-recombination universe.These vortical modes inturn leave a characteristic imprint on the temperatureanisotropy of the Cosmic Microwave Background (CMB), if the CMB photons can bere-scatterred after recombination. Observations from WMAP indicate that theUniverse underwent a relatively early re-ionization ($z_{ri} \sim 15$), whichdoes indeed lead to a significant optical depth for re-scattering of CMBphotons after the re-ionization epoch. We compute the resulting additionaltemperature anisotropies, induced by primordial magnetic fields in thepost-recombination universe. We show that in models with early re-ionization, anearly scale-invariant spectrum of tangled magnetic fields which redshift to apresent value of $B_0 \sim 3 \times 10^{-9}$ Gauss, produce vector modeperturbations which in turn induce additional temperature anisotropy of about0.3 to 0.4 $ \mu$K over very small angular scales, with $ l$ upto $\sim 10000 $or so.Comment: 12 pages. Contains one figure. Submitted to Phys. Rev.

CMB anisotropy due to tangled magnetic fields in reionized models