On the Origin of Linear Polarization in Solar Flares

0440079 - ASÚ 2015 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Štěpán, Jiří - Heinzel, Petr
On the Origin of Linear Polarization in Solar Flares.
Solar Polarization 7. San Francisco: Astronomical Society of the Pacific, 2014 - (Nagendra, K.), s. 133-134. ASP Conference Series, 489. ISBN 9781583818633.
[Solar Polarization 7. Kunning (CN), 09.09.2013-13.09.2013]
Grant CEP: GA ČR GPP209/12/P741; GA ČR GAP209/12/1652
Institucionální podpora: RVO:67985815
Klíčová slova: solar flares * linear polarization
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika

A significant degree of linear polarization (up to few percent) of some spectral lines is occasionally reported from the observations of solar flares. This polarization is often found at the edges of the flare ribbons and it is usually radial or tangential. The mechanism usually considered as being responsible for this effect is the impact polarization by electron and/or proton beams bombarding the chromosphere. We point out that resonant scattering polarization in a multi-dimensional geometry of the chromosphere has to be considered as an important ingredient of the problem. The significant horizontal inhomogeneities at the boundaries of the flare ribbons causes a considerable change in the radiation field anisotropy which may lead to emission of strongly linearly polarized spectral lines.
Trvalý link: http://hdl.handle.net/11104/0243216