  A peculiar microwave quasi-periodic pulsation with zigzag pattern (Z-QPP) is
observed first by the Chinese Solar Broadband Spectrometer in Huairou
(SBRS/Huairou) at 1.10-1.34 GHz in a solar flare on 2005-01-15. The Z-QPP
occurred just in the early rising phase of the flare with weakly right-handed
circular polarization. Its period is only several decades millisecond.
Particularly, before and after the pulsation, there are many spectral fine
structures, such as zebra patterns, fibers, and millisecond spikes. The
microwave Z-QPP can provide some kinematic information of the source region in
the early rising phase of the flare, and the source width changes from about
1000 km to 3300 km, even if we have no imaging observations. The abundant
spectral fine structures possibly reflect the dynamic features of non-thermal
particles.
