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We have been performing daily observations of bright microquasars at1.2-20~GHz with the Northern sector of RATAN-600 radio telescope for more thanten years. During the 2019--2021 observations we recorded bright flares, whichwe call giant flares because fluxes reach record levels -- above 20~Jy --during these events. In this paper we report the results of intraday variationsof the Cygnus~X-3} microquasar in multi-azimuth observations made with the"North sector with a flat-sheet reflector" during giant flares of Cygnus X-3.These were the first such observations made simultaneously at severalfrequencies on a short time scale (10 minutes). Observational data consists of31 measurement made within +/-2.7 hours of the culmination of the object. Weare the first to discover the evolution of the spectrum of the flare emissionof Cygnus~X-3 on a time scale comparable to the orbital period of the binary.The measurement data allowed us to determine the temporal and spectralparameters of radio emission, which are typical for synchrotron flare emissionin relativistic jets. Evolution of the radio emission of X-ray binaries onshort time scales is a key to understanding the formation of jet outbursts inthe process of mass accretion of the matter of the donor star onto therelativistic object.

Study of the Cygnus X-3 Microquasar with the RATAN-600 Radio telescope in Multi-Azimuth Observing Mode