Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...341..896h&link_type=abstract
Astronomy and Astrophysics, v.341, p.896-901 (1999)
Astronomy and Astrophysics
Astrophysics
7
Line: Formation, Polarization, Sun: Flares, Sun: Particle Emission, Sun: X-Rays, Gamma Rays
Scientific paper
Soft X-rays irradiation of the solar atmosphere during solar flares generates photoelectrons which have an anisotropic velocity distribution. Using a 1-D test particle code, the anisotropy of the photoelectrons velocity distribution is derived, and the maximum degree of linear polarization in the hydrogen Hα and Hβ lines that photoelectrons could generate by impact is estimated. Over a band pass of 0.75 and 0.5 Angstroms, the net polarization degree expected in both lines is predicted not to exceed 0.2%. Therefore, soft X-ray irradiation cannot explain the one order of magnitude higher degree of linear polarization observed in solar flares.
Hénoux Jean-Claude
Karlicky Marian
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