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Paper: Modelling Broadband Polarisation in Sunspots
Volume: 118, First Advances in Solar Physics Euroconference: Advances in the Physics of Sunspots
Page: 242
Authors: Stift, Martin J.
Abstract: The effect of line overlap (blending) on broadband linear (NLP) and circular (NCP) polarisation in spectra of solar magnetic regions, especially sunspot umbrae, is explored in a systematic way, employing spectrum synthesis in polarised light on a grand scale over thousands of { Angstroms}ngstr{o}ms. An extensive grid of theoretical StokesIQUV spectra allows the discussion of the dependence of NLP and NCP on atmospheric parameters such as temperature, microturbulence, magnetic field strength and direction. NCP, resulting from incomplete cancellation of excess circular polarisation originating in blends (a small-number statistical effect), can attain observable values even in perfectly static atmospheres.
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