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On the Origin of Linear Polarization in Solar Flares
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SYSNO ASEP 0440079 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title On the Origin of Linear Polarization in Solar Flares Author(s) Štěpán, Jiří (ASU-R) RID, ORCID
Heinzel, Petr (ASU-R) RID, ORCIDSource Title Solar Polarization 7. - San Francisco : Astronomical Society of the Pacific, 2014 / Nagendra K.N. - ISBN 9781583818633 Pages s. 133-134 Number of pages 2 s. Publication form Print - P Action Solar Polarization 7 Event date 09.09.2013-13.09.2013 VEvent location Kunning Country CN - China Event type WRD Language eng - English Country US - United States Keywords solar flares ; linear polarization Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics R&D Projects GPP209/12/P741 GA ČR - Czech Science Foundation (CSF) GAP209/12/1652 GA ČR - Czech Science Foundation (CSF) Institutional support ASU-R - RVO:67985815 UT WOS 000370308600014 Annotation 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. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2015
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