Spectropolarimetric diagnostics of non-thermal particles in the solar chromosphere

Linear impact polarization of chromospheric lines has already been observed in the impulsive phase of solar flares, which can be interpreted as the results of the bombardment of an anisotropic non-thermal particle beam in the atmosphere. Using the spectropolarimetric observations of THEMIS, we have measured the degrees and the directions of the polarization from Hα and CaII 8542 Stokes line profiles of Ellerman Bombs, bright points and faint flares, which occur mainly in the solar lower atmosphere. We attempt to explore the main characters of the non-thermal energetic particles from its effect on the impact linear polarization of the chromospheric lines. The existence of this polarization due to non-thermal particles can provide the evidence of reconnection in the solar lower atmosphere.