| Presenter: | Natalia Firstova |
| Affiliation: | Institute of Solar-Terrestrial Physics RAS |
| Title: | Impact linear polarization on impulsive phase of proton flare observations with high spatial resolution |
| Authors: | N.M. Firstova, V.I. Polyakov, A.V. Firstova |
| Form: | poster |
| Abstract: | The study has been carried out of the impulsive phase of the 2B/X4.8 proton flare according to observations at Large Solar Vacuum Telescope (LSVT) by the spectropolarimetric method with high spatial, spectral, and time resolution. On the basis of 49 spectrograms and 1200 cuts across the flare ribbons a certain evidence for H$\alpha$ line impact polarization has been obtained. The stable change of the $Q$ and $U$ Stokes parameter values has been detected across the ribbons for different flare regions measured at a step of 0.85’’. In the east side of the ribbons, the degree of polarization is 4--8\% with its plane oriented toward the solar disk center (radial direction). In the west side, the polarization degree is up to 25\%, and its plane is perpendicular to the disk center direction (tangential direction). The comparison of the results with the hard X-ray data (RHESSI) allows us to make a conclusion about the dominating role of high-energy electron beams in a chromosphere heating during the flare. A change of the polarization sign and zero values of the polarization within the ribbons indicate an electron energy of about 200 eV in the beam. The shift of the polarization maximum relative to the emission maximum in the ribbons can be explained by the electron beam inclination to the solar surface. |
| Session: | 2. Polarization physics in magnetized media |
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