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Using numerical simulations we show that low-amplitude Alfv\'en waves from amagnetar quake propagate to the outer magnetosphere and convert to "plasmoids"(closed magnetic loops) which accelerate from the star, driving blast wavesinto the magnetar wind. Quickly after its formation, the plasmoid becomes athin relativistic pancake. It pushes out the magnetospheric field lines, andthey gradually reconnect behind the pancake, generating a variable wind farstronger than the normal spindown wind of the magnetar. Repeating ejectionsdrive blast waves in the amplified wind. We suggest that these ejectionsgenerate the simultaneous X-ray and radio bursts detected from SGR 1935+2154. Amodest energy budget of the magnetospheric perturbation $\sim 10^{40}$ erg issufficient to produce the observed bursts. Our simulation predicts a narrow (afew ms) X-ray spike from the magnetosphere, arriving almost simultaneously withthe radio burst emitted far outside the magnetosphere. This timing is caused bythe extreme relativistic motion of the ejecta.

Plasmoid ejection by Alfv\'en waves and the fast radio bursts from SGR 1935+2154