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One of the most important products of solar flares are nonthermal energeticparticles which may carry up to 50\% energy releasing in the flaring processes.In radio observations, nonthermal particles generally manifest as spectral finestructures with fast frequency drifting rates, named as solar fast driftingradio bursts (FDRBs). This work demonstrated three types of FDRBs, includingtype III pair bursts, narrow band stochastic spike bursts following the typeIII bursts and spike-like bursts superimposed on type II burst in an X1.3 flareon 2014 April 25. We find that although all of them have fast frequencydrifting rates, but they are intrinsically different from each other infrequency bandwidth, drifting rate and the statistical distributions. Wesuggest that they are possibly generated from different acceleratingmechanisms. The type III pair bursts may be triggered by high-energy electronbeams accelerated by the flaring magnetic reconnection, spike bursts areproduced by the energetic electrons accelerated by a termination shock wavetriggered by the fast reconnecting plasma outflows impacting on the flaringlooptop, and spike-like bursts are possibly generated by the nonthermalelectrons accelerated by moving magnetic reconnection triggered by theinteraction between CME and the background magnetized plasma. These results mayhelp us to understand the generation mechanism of nonthermal particles andenergy release in solar flares.

Solar Fast Drifting Radio Bursts in an X1.3 Flare on 2014 April 25