Analysis of unresolved photospheric magnetic field structure using Fe I 6301 and 6302 lines
Analysis of unresolved photospheric magnetic field structure using Fe I 6301 and 6302 lines
复制标题
使用 Fe I 6301 和 6302 线分析未解析的光球磁场结构
DOI:
10.1051/0004-6361/201833421
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发表时间:
2018
影响因子:
6.5
通讯作者:
Gordovskyy M
中科院分区:
文献类型:
--
作者:
Gordovskyy M
Early magnetographic observations indicated that magnetic field in the solar photosphere has unresolved small-scale structure. Near-infrared and optical data with extremely high spatial resolution show that these structures have scales of few tens of kilometres, which are not resolved in the majority of solar observations. The goal of this study is to establish the effect of unresolved photospheric magnetic field structure on Stokes profiles observed with relatively low spatial resolution. Ultimately, we aim to develop methods for fast estimation of the photospheric magnetic filling factor and line-of-sight gradient of the photospheric magnetic field, which can be applied to large observational data sets. We exploit 3D MHD models of magneto-convection developed using MURAM code. Corresponding profiles of Fe I 6301.5 and 6302.5 $\mathrm{\AA}$ spectral lines are calculated using NICOLE radiative transfer code. The resulting I and V Stokes [x,y,] cubes with reduced spatial resolution of 150 km are used to calculate magnetic field values as they would be obtained in observations with Hinode/SOT or SDO/HMI. Three different methods of the magnetic filling factor estimation are considered: the magnetic line ratio method, Stokes V width method and a simple statistical method. We find that the statistical method and the Stokes V width method are sufficiently reliable for fast filling factor estimations. Furthermore, we find that Stokesbisector splitting gradient can be used for fast estimation of line-of-sight gradient of the photospheric magnetic field.
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DOI:
10.1086/175800
发表时间:
1995-06
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Haosheng Lin
通讯作者:
Haosheng Lin
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
K. Sankarasubramanian;T. Rimmele
通讯作者:
T. Rimmele
DOI:
--
发表时间:
1994
期刊:
影响因子:
--
作者:
N. Lozitska;V. Lozitskij
通讯作者:
V. Lozitskij
影响因子:
6.5
作者:
E. Khomenko;S. Shelyag;S. Solanki;A. Vögler
通讯作者:
A. Vögler
影响因子:
0.9
作者:
A. Tritschler;T. Rimmele;S. Berukoff;R. Casini;J. Kuhn;Haosheng Lin;M. Rast;J. McMullin;W. Schmidt;F. Wöger;D. Team
通讯作者:
D. Team