Аннотация:We studied a solar flare with pronounced quasi-periodic pulsations detected in
the microwave, X-ray, and radio bands. We used correlation, Fourier, and wavelet analyses
methods to examine the temporal fine structures and relationships between the time profiles
in each wave band. We found that the time profiles of the microwaves, hard X-rays, and
type III radio bursts vary quasi-periodically with a common period of 40 – 50 s. The average
amplitude of the variations is high, above 30 % of the background flux level, and reaches
80 % after the flare maximum. We did not find this periodicity in either the thermal Xray
flux component or in the source size dynamics. Our findings indicate that the detected
periodicity is probably associated with periodic dynamics in the injection of non-thermal
electrons, which can be produced by periodic modulation of magnetic reconnection.