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We have studied the powerful solar flare of January 20, 2005 by the method, previously proposed in the SINP NSU. The study of active processes in the outer levels of the Sun requires the using information about physical conditions in these external layers, or suppositions about the model of solar atmospheric levels. The main characteristics of the nuclear processes are density and chemical composition. Also, this list may include temperature, pressure, isotope composition and other parameters. The method of study flares, using neutrons suppose the knowledge or suppositions about density vertical profile of surrounding medium and chemical and isotopic composition of the region of acceleration. Our studies are founded on nuclear methods, particularly, gamma-emissions from acceleration processes and nuclear reactions. Initially we used the standard models. Later we also composed new models for find the best ones for describe the processes in the flares.