Stokes diagnostics of simulated solar magneto-convection

Shelyag, Sergiy, Schüssler, Manfred, Solanki, Sami K. and Vögler, Alexander (2007) Stokes diagnostics of simulated solar magneto-convection. Astronomy & Astrophysics, 469 (2). pp. 731-747. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20066819

Abstract

We present results of synthetic spectro-polarimetric diagnostics of radiative MHD simulations of solar surface convection with magnetic fields. Stokes profiles of Zeeman-sensitive lines of neutral iron in the visible and infrared spectral ranges emerging from the simulated atmosphere have been calculated in order to study their relation to the relevant physical quantities and compare with observational results. We have analyzed the dependence of the Stokes-I line strength and width as well as of the Stokes-V signal and asymmetries on the magnetic field strength. Furthermore, we have evaluated the correspondence between the actual velocities in the simulation with values determined from the Stokes-I (Doppler shift of the centre of gravity) and Stokes-V profiles (zero-crossing shift). We confirm that the line weakening in strong magnetic fields results from a higher temperature (at equal optical depth) in the magnetic flux concentrations. We also confirm that considerable Stokes-V asymmetries originate in the peripheral parts of strong magnetic flux concentrations, where the line of sight cuts through the magnetopause of the expanding flux concentration into the surrounding convective donwflow.

Item Type: Article
Additional Information: Reproduced with permission from Astronomy & Astrophysics, © ESO
Uncontrolled Keywords: Sun: atmosphere, Sun: faculae, plages, Sun: magnetic fields, Sun: infrared, line: profiles, polarization
Subjects: F300 Physics
F500 Astronomy
G100 Mathematics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Sergiy Shelyag
Date Deposited: 23 May 2016 09:05
Last Modified: 21 Oct 2017 16:18
URI: http://nrl.northumbria.ac.uk/id/eprint/26914

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