Linear polarization of the helium D3 line by accelerated protons in the solar chromosphere

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Abstract

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.

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About the authors

M. В. Shapochkin

Moscow Physical Society

Author for correspondence.
Email: labex@yandex.ru
Russian Federation, Moscow

S. A. Bogachev

Space Research Institute of the Russian Academy of Sciences

Email: labex@yandex.ru
Russian Federation, Moscow

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Supplementary files

Supplementary Files
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2. Fig. 1. Cross-section of excitation by electrons (red solid line) and protons (blue dashed line) of the 3D33,2,1 – 2P32,1,0 transition of the He I atom.

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3. Fig. 2. Temperature dependence of the rate of excitation processes of the 3D33.2.1 – 2P32.1.0 transition of the He I atom by electrons (red) and protons (blue).

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4. Fig. 3. Distribution of accelerated protons in the solar atmosphere. The solid line (red) is the initial power-law distribution EN = 0 with slope φ = 3 and minimum energy ε = 10 keV. The dotted line (blue) is the distribution of particles at a depth of EN = 100 keV (x ≈ 1600 km). The dotted line (black) is the distribution of particles at a depth of EN = 200 keV (x ≈ 1800 km).

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5. Fig. 4. An example of calculating the effective power spectrum (red line) from the original spectrum (blue line) inside the chromosphere.

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6. Fig. 5. Dependence of the degree of linear polarization of ionized gas on the parameter ε1 for δ = 2.5 and θ = 37.5°.

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7. Fig. 6. Dependence of the degree of linear polarization of ionized gas on the value of the pitch angle θ at δ = 2.5, ε1 = 15 keV.

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8. Fig. 7. Dependence of the degree of linear polarization of ionized gas on the parameter n for d = 2.5, ε1 = 15 keV and θ = 37.5°.

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