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Quasi-coherent oscillations have been detected in the extreme ultravioletflux of the dwarf nova SS Cygni during observations with the ExtremeUltraviolet Explorer satellite of the rise and plateau phases of an anomalousoutburst in 1993 August and a normal outburst in 1994 June/July. On bothoccasions, the oscillation turned on during the rise to outburst and persistedthroughout the observation. During the 1993 outburst, the period of theoscillation fell from 9.3 s to 7.5 s over an interval of 4.4 days; during the1994 outburst, the period fell from 8.9 s to 7.19 s (the shortest period everobserved in SS Cyg, or any other dwarf nova) within less than a day, and thenrose to 8.0 s over an interval of 8.0 days. For both outbursts, the period $P$of the oscillation was observed to correlate with the 75--120 \AA \ count rate$I_{\rm EUV}$ according to $P\propto I_{\rm EUV}^{-0.094}$. A magnetosphericmodel is considered to reproduce this variation. It is found that an effectivehigh-order multipole field is required, and that the field strength at thesurface of the white dwarf is 0.1--1 MG. Such a field strength is at the lowerextreme of those measured or inferred for bona fide magnetic cataclysmicvariables.Comment: 17 pages, LaTeX format, 2 Postscript figures, uses aasms4.st

Quasi-Coherent Oscillations in the Extreme Ultraviolet Flux of the Dwarf Nova SS Cygni