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Using the Stokes V widths of Fe I lines for diagnostics of the intrinsic solar photospheric magnetic field

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posted on 2020-01-01, 00:00 authored by M Gordovskyy, Sergiy ShelyagSergiy Shelyag, P K Browning, V G Lozitsky
Aims. The goal of this study is to explore a novel method for the solar photospheric magnetic field diagnostics using Stokes V widths of different magnetosensitive Fe I spectral lines.

Methods. We calculate Stokes I and V profiles of several Fe I lines based on a one-dimensional photospheric model VAL C using the NICOLE radiative transfer code. These profiles are used to produce calibration curves linking the intrinsic magnetic field values with the widths of blue peaks of Stokes V profiles. The obtained calibration curves are then tested using the Stokes profiles calculated for more realistic photospheric models based on magnetohydrodynamic of magneto-convection.

Results. It is shown that the developed Stokes V widths method can be used with various optical and near-infrared lines. Out of six lines considered in this study, Fe I 6301 line appears to be the most effective: it is sensitive to fields over ∼200 G and does not show any saturation up to ∼2 kG. Other lines considered can also be used for the photospheric field diagnostics with this method, however, only in narrower field value ranges, typically from about 100 G to 700–1000 G.

Conclusions. The developed method can be a useful alternative to the classical magnetic line ratio method, particularly when the choice of lines is limited.

History

Journal

Astronomy and astrophysics

Volume

633

Article number

A136

Pagination

1 - 6

Publisher

EDP Sciences

Location

Les Ulis, France

ISSN

0004-6361

eISSN

1432-0746

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

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