Polarization diagnostics of proton beams in solar flares
| dc.creator | Stepan, Jiri | |
| dc.date | 2007-02-02 | |
| dc.date.accessioned | 2026-07-07T11:21:04Z | |
| dc.date.available | 2026-07-07T11:21:04Z | |
| dc.description | 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. | |
| dc.description | 6 pages, 6 figures; will appear in the proceedings of the "Solar Magnetism and Dynamics & THEMIS Users meeting", 2006 November 15-17, Meudon, France | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0702060 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0702060 | |
| dc.identifier | Mem.Soc.Ast.It.78:83,2007 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/194156 | |
| dc.subject | Astrophysics | |
| dc.title | Polarization diagnostics of proton beams in solar flares | |
| dc.type | text |