A Green's Function Method for Calculating the Potential Magnetic Field in Solar Active Regions in a Spherical Geometry

被引：2

作者：

Sadykov, V. M. ^{[1
,2
]}

Zimovets, I. V. ^{[1
]}

机构：

[1] Russian Acad Sci, Space Res Inst, Moscow 117997, Russia

[2] Moscow Phys Tech Inst, Dolgoprudnyi 141700, Moscow Oblast, Russia

来源：

ASTRONOMY REPORTS | 2014年 / 58卷 / 05期

基金：

俄罗斯基础研究基金会;

关键词：

Active Region; Solar Phys; Astronomy Report; Potential Approximation; Solar Active Region;

D O I：

10.1134/S1063772914050059

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A Green's function solution of Laplace's equation for the potential magnetic field in an external spherical region is found using the derivative of the potential along a selected direction as a boundary condition. A set of programs applying this solution to construct the potential magnetic-field lines in solar active regions based on the photospheric line-of-sight field component has been developed. The method is tested using some model fields, and the optimal step size is found for realistic conditions. The developed software is applied to four real solar active regions, adopting HMI/SDO magnetograms as the boundary conditions. The potential magnetic field in the chromosphere and corona have been reconstructed for the selected regions. The calculated field lines are compared with flux tubes observed by AIA/SDO in the EUV. This comparison is used as a basis to discuss the applicability of a potential field approximation to the magnetic fields in solar active regions.

引用

页码：345 / 352

页数：8

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