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Published online by Cambridge University Press: 14 August 2015
On the basis of Hα pictures of two proton flares of medium size, the volume of the separate parts of magnetic-channel flares, are given. At the time of the main release of energy the volume of the whole system is determined at ∼ 2.5 × 1027 cm3 and the size of areas III after Petschek model at ∼ 7.0 × 1020 cm3.