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We present the first model of full-sky polarized synchrotron emission that isderived from all WMAP and Planck LFI frequency maps. The basis of this analysisis the set of end-to-end reprocessed Cosmoglobe Data Release 1 sky mapspresented in a companion paper, which have significantly lower instrumentalsystematics than the legacy products from each experiment. We find that theresulting polarized synchrotron amplitude map has an average noise rms of$3.2\,\mathrm{\mu K}$ at 30 GHz and $2^{\circ}$ FWHM, which is 30% lower thanthe recently released BeyondPlanck model that included only LFI+WMAP Ka-V data,and 29% lower than the WMAP K-band map alone. The mean $B$-to-$E$ powerspectrum ratio is $0.40\pm0.02$, with amplitudes consistent with those measuredpreviously by Planck and QUIJOTE. Assuming a power law model for thesynchrotron spectral energy distribution, and using the $T$--$T$ plot method,we find a full-sky inverse noise-variance weighted mean of$\beta_{\mathrm{s}}=-3.07\pm0.07$ between Cosmoglobe DR1 K-band and 30 GHz, ingood agreement with previous estimates. In summary, the novel Cosmoglobe DR1synchrotron model is both more sensitive and systematically cleaner thansimilar previous models, and it has a more complete error description that isdefined by a set of Monte Carlo posterior samples. We believe that theseproducts are preferable over previous Planck and WMAP products for allsynchrotron-related scientific applications, including simulation, forecastingand component separation.

Cosmoglobe DR1. III. First full-sky model of polarized synchrotron emission from all WMAP and Planck LFI data