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Drifting pulsation structures (DPSs) are important radio fine structuresusually observed at the beginning of eruptive solar flares. It has beensuggested that DPSs carry important information on the energy release processesin solar flares. We study DPS observed in an X8.2-class flare on 2017 September10 in the context of spatial and spectral diagnostics provided by microwave,EUV, and X-ray observations. We describe DPS and its sub-structures that wereobserved for the first time. We use a new wavelet technique to revealcharacteristic periods in DPS and their frequency bands. Comparing the periodsof pulsations found in this DPS with those in previous DPSs we found new veryshort periods in the 0.09-0.15 s range. We present EOVSA images and spectra ofmicrowave sources observed during the DPS. This DPS at its very beginning haspulsations in two frequency bands (1000-1300 MHz and 1600--1800 MHz) which areinterconnected by fast drifting bursts. We show that these double-bandpulsations started just at the moment when the ejected filament splits apart ina tearing motion at the location where a signature of the flare currentsheetlater appeared. Using the standard flare model and previous observationsof DPSs, we interpret these double-band pulsations as a radio signature ofsuperthermal electrons trapped in the rising magnetic rope and flare arcade atthe moment when the flare magnetic reconnection starts. The results arediscussed in a scenario with the plasmoid in the rising magnetic rope.

Drifting Pulsation Structure at the Very Beginning of the 2017 September 10 Limb Flare