Baolin Tan
National Astronomical Observatories, Chinese Academy of Sciences,
Datun Road A20, Chaoyang District, Beijing 100012, China
Solar microwave observations of the X3.4 Flare/CME event
observed in Chinese Huairou solar radiospectrometer on December 13,
2006, show a series of very short period pulsations (VSP) with the
period of 
1.0 s in the frequency range of 2.60 - 3.80 GHz. These
pulsations are quasi-periodic, may be classified into two sub-sorts,
one is the fast VSP with the periods of 25 - 80 ms, the other kind is
slow VSP with the periods of 
100 ms. We proposed a detailed
analysis on the observations of radiospectrometer and comparison with
high cadence Rhessi hard X-rays. Then an interpretation is presented
theoretically.