Linear Polarization of the Helium D3 Line by Accelerated Protons in the Solar Chromosphere

In the article, we have studied the impact linear polarization of the helium D₃ line that takes place in the solar chromosphere under the action of protons accelerated in solar flares. The dependence of the energy distribution of protons on the distance traveled inside the chromosphere is calculated. The ratio of the concentrations of nonthermal protons and thermal electrons at different depths is theoretically determined. From the calculation of the degree of linear polarization of the helium line D₃ for different layers of the chromosphere, the region of probable formation of the line is determined.