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Accreting white dwarfs in binary systems known as cataclysmic variables (CVs)have in recent years been shown to produce radio flares during outbursts,qualitatively similar to those observed from neutron star and black hole X-raybinaries, but their ubiquity and energetic significance for the accretion flowhas remained uncertain. We present new radio observations of the CV SS Cyg withArcminute Microkelvin Imager Large Array, which show for the second timelate-ouburst radio flaring, in April 2016. This flaring occurs during theoptical flux decay phase, about ten days after the well-established early-timeradio flaring. We infer that both the early- and late-outburst flares are acommon feature of the radio outbursts of SS Cyg, albeit of variable amplitudes,and probably of all dwarf novae. We furthermore present new analysis of thephysical conditions in the best-sampled late-outburst flare, from Feb 2016,which showed clear optical depth evolution. From this we can infer that thesynchrotron-emitting plasma was expanding at about 1% of the speed of light,and at peak had a magnetic field of order 1 Gauss and total energy content >10^{33} erg. While this result is independent of the geometry of thesynchrotron-emitting region, the most likely origin is in a jet carrying away asignificant amount of the available accretion power.

Late-outburst radio flaring in SS Cyg and evidence for a powerful kinetic output channel in cataclysmic variables