  Quasi-periodic wiggles of microwave zebra pattern structures with period
range from about 0.5 s to 1.5 s are found in a X-class solar flare on 2006
December 13 at the 2.6-3.8 GHz with the Chinese Solar Broadband Radio
Spectrometer (SBRS/Huairou). Periodogram and correlation analysis show that the
wiggles have two-three significant periodicities and almost in phase between
stripes at different frequency. The Alfven speed estimated from the zebra
pattern structures is about 700 Km/s. We obtain the spatial size of the
waveguiding plasma structure to be about 1 Mm with the detected period of about
1 s. It suggests the ZP wiggles can be associated with the fast mag-
netoacoustic oscillations in the flaring active region. The lack of a
significant phase shift between wiggles of different stripes suggests that the
ZP wiggles are caused by a standing sausage oscillation.
