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

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...1e..55s&link_type=abstract

Cosmic Particle Acceleration, 26th meeting of the IAU, Joint Discussion 1, 16-17 August, 2006, Prague, Czech Republic, JD01, #55

Physics

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 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 H-alpha forming layers lead to negligible line polarization. Thus the proton beams seem not to be a good candidate for explanation of the observed polarization degree.

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