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Published online by Cambridge University Press: 14 August 2015
A solar flare has various aspects: the optical flare is often associated with emissions in the microwave or X-ray regions: this indicates the occurrence of a highly excited plasma, which we call the high-energy flare plasma. The existence of the high-energy flare plasma was first shown by radio observations in the microwave regions (Hachenberg) and later confirmed by X-ray observations in the energy range 102–106 eV.