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Based on the analysis of the microwave observations at frequency of 2.60 --3.80 GHz in a solar X1.3 flare event observed at Solar BroadbandRadioSpectrometer in Huairou (SBRS/Huairou) on 2005 July 30, an interestingreversed drifting quasi-periodic pulsating structure (R-DPS) is confirmed. TheR-DPS is mainly composed of two drifting pulsating components: one is arelatively slow very short-period pulsation (VSP) with period of about 130 --170 ms, the other is a relatively fast VSP with period of about 70 -- 80 ms.The R-DPS has a weak left-handed circular polarization. Based on the syntheticinvestigations of Reuven Ramaty High Energy Solar Spectroscopic Imaging(RHESSI) hard X-ray, Geostationary Operational Environmental Satellite (GOES)soft X-ray observation, and magnetic field extrapolation, we suggest the R-DPSpossibly reflects flaring dynamic processes of the emission source regions.

Reversed Drifting Quasi-periodic Pulsating Structure in an X1.3 Solar Flare on 2005 July 30