  The connection between accretion and jet production in accreting white dwarf
binary systems, especially dwarf novae, is not well understood. Radio
wavelengths provide key insights into the mechanisms responsible for
accelerating electrons, including jets and outflows. Here we present
densely-sampled radio coverage, obtained with the Arcminute MicroKelvin Imager
Large Array, of the dwarf nova SS Cyg during its February 2016 anomalous
outburst. The outburst displayed a slower rise (3 days per mag) in the optical
than typical ones, and lasted for more than 3 weeks. Rapid radio flaring on
timescales <1 hour was seen throughout the outburst. The most intriguing
behavior in the radio was towards the end of the outburst where a fast,
luminous ("giant"), flare peaking at ~20 mJy and lasting for 15 minutes was
observed. This is the first time that such a flare has been observed in SS Cyg,
and insufficient coverage could explain its non-detection in previous
outbursts. These data, together with past radio observations, are consistent
with synchrotron emission from plasma ejection events as being the origin of
the radio flares. However, the production of the giant flare during the
declining accretion rate phase remains unexplained within the standard
accretion-jet framework and appears to be markedly different to similar
patterns of behavior in X-ray binaries.
