Polarization diagnostics of proton beams in solar flares

Details Polarization diagnostics of proton beams in solar flares Polarization diagnostics of proton beams in solar flares

2007-02-02

arxiv.org/abs/astro-ph/0702060v1

Mem.Soc.Ast.It.78:83,2007

Astronomy and Astrophysics

Astrophysics

6 pages, 6 figures; will appear in the proceedings of the "Solar Magnetism and Dynamics & THEMIS Users meeting", 2006 November

Scientific paper

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.

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