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- W1570744573 abstract "We review the problem of proton beam bombardment of solar chromosphere considering the self-consistent NLTE polarized radiation transfer in hydrogen lines. Several observations indicate a linear polarization of the H-alpha line of the order of 5% or higher and preferentially in radial direction. This polarization is often explained as anisotropic collisional excitation of the n=3 level by vertical proton beams. Our calculations indicate that deceleration of the proton beam with initial power-law energy distribution together with increased electron and proton densities in the H-alpha forming layers lead to a negligible line polarization. Thus the proton beams seem not to be a good candidate for explanation of the observed polarization degree. On the other hand, the effect of electric return currents could perhaps provide a better explanation of the observed linear polarization. We report the new calculations of this effect." @default.
- W1570744573 created "2016-06-24" @default.
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- W1570744573 date "2007-02-02" @default.
- W1570744573 modified "2023-10-14" @default.
- W1570744573 title "Polarization diagnostics of proton beams in solar flares" @default.
- W1570744573 hasPublicationYear "2007" @default.
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