Spectro-polarimetric simulations of the solar limb: absorption-emission Fe I 6301.5 Å AND 6302.5 Å line profiles and torsional flows in the intergranular magnetic flux concentrations

Shelyag, Sergiy (2015) Spectro-polarimetric simulations of the solar limb: absorption-emission Fe I 6301.5 Å AND 6302.5 Å line profiles and torsional flows in the intergranular magnetic flux concentrations. The Astrophysical Journal, 801 (1). p. 46. ISSN 1538-4357

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Official URL: http://dx.doi.org/10.1088/0004-637X/801/1/46

Abstract

Using radiative magnetohydrodynamic simulations of the magnetized solar photosphere and detailed spectro-polarimetric diagnostics with the Fe I 6301.5 Å and 6302.5 Å photospheric lines in the local thermodynamic equilibrium approximation, we model active solar granulation as if it was observed at the solar limb. We analyze general properties of the radiation across the solar limb, such as the continuum and the line core limb darkening and the granulation contrast. We demonstrate the presence of profiles with both emission and absorption features at the simulated solar limb, and pure emission profiles above the limb. These profiles are associated with the regions of strong linear polarization of the emergent radiation, indicating the influence of the intergranular magnetic fields on the line formation. We analyze physical origins of the emission wings in the Stokes profiles at the limb, and demonstrate that these features are produced by localized heating and torsional motions in the intergranular magnetic flux concentrations.

Item Type: Article
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 11:03
Last Modified: 08 May 2017 17:54
URI: http://nrl.northumbria.ac.uk/id/eprint/26891

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