PULSATIONS IN MICROWAVE-BURSTS FROM 2 SOURCES DURING SOLAR-FLARES ON JULY 11, 1991

The results of observations of two solar-active regions at wavelengths of 3.5, 2.8, 2.25, and 1.95 cm with the 22-meter radio telescope of t he Crimean Astrophysical Observatory are presented. The comparative an alysis of polarized radio emission of the active regions allowed us to identify a sympathetic burst with pulsations from the source, located at a distance of L greater-than-or-equal-to 4 x 10(5) km from the sit e of initial flare. Dynamic Fourier-spectra of the radio emission puls ations of the interacting active regions contained reliable components at frequencies 0.029, 0.033, and 0.045 Hz, as well as their second ha rmonics. A density-modulated stream of energetic (epsilon > 10 keV) el ectrons, moving with velocities approximately 6 x 10(4) km s-1 inside the coronal magnetic arc that connected the two active regions, is ass umed to be the trigger of the sympathetic burst.