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We analyzed spatial and spectral characteristics of quasi-periodic pulses(QPP) for the 18 August 2012 limb are, using new data from a complex ofspectral and imaging instruments developed by the Siberian Solar RadioTelescope team and the Wind/Konus gamma-ray spectrometer. A sequence ofbroadband pulses with periods of approximately ten seconds were observed inX-rays at energies between 25 keV and 300 keV, and in microwaves at frequenciesfrom a few GHz up to 34 GHz during an interval of one minute. The QPP X-raysource was located slightly above the limb where the south legs of large andsmall EUV loop systems were close to each other. Before the QPPs the soft X-rayemission and the Ramaty High Energy Solar Spectroscopic Imager signal from theenergy channels below 25 keV were gradually arising for several minutes at thesame location. It was found that each X-ray pulse showed the soft-hard-softbehavior. The 17 and 34 GHz microwave source were at footpoints of the smallloop system and the source emitting in the 4.2 {7.4 GHz band in the large one.The QPPs were probably generated by modulation of acceleration processes in theenergy release site. Analyzing radio spectra we determined the plasmaparameters in the radio sources. The microwave pulses could be explained byrelatively weak variations of the spectrum hardness of emitting electrons.

Sources of Quasi-Periodic Pulses in the 18 August 2012 Flare