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Paper: Electron Acceleration and Spectral Hardening of Continuum Emission in Solar Flares
Volume: 484, Outstanding Problems in Heliophysics: From Coronal Heating to the Edge of the Heliosphere
Page: 123
Authors: Li, G.; Kong, X.; Chen, Y.; Zank, G. P.; Zhao, L.
Abstract: Continuum emissions in many solar flares are consistent with double power laws with a hardening at energies ∼> 300 ke V. At least in electron-dominated events the hardening in photon spectrum reflects an intrinsic hardening in the source electron spectrum. A possible explanation for the hardening is diffusive shock acceleration of electrons at a termination shock with a finite width. We briefly discuss this mechanism here as well as some of its implications. A statistical study supports the proposed mechanism.
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