A Unified and Very Fast Way for Computing the Global Potential and Linear Force-Free Fields
文献类型：期刊论文
| 作者 | Jiang, Chaowei; Feng, Xueshang |
| 刊名 | SOLAR PHYSICS
 |
| 出版日期 | 2012 |
| 卷号 | 281期号:2页码:621-637 |
| ISSN号 | 0038-0938 |
| 关键词 | Fast solver Linear force-free fields Potential fields Solar corona |
| 通讯作者 | Jiang, CW (reprint author), Chinese Acad Sci, SIGMA Weather Grp, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China. |
| 中文摘要 | We present a fast solver for computing potential and linear force-free fields (LFFF) above the full solar disk with a synoptic magnetic map as input. The global potential field and the LFFF are dealt with in a unified way by solving a three-dimensional Helmholtz equation in a spherical shell and a two-dimensional Poisson equation on the solar surface. The solver is based on a combination of the spectral method and the finite-difference scheme. In the longitudinal direction the equation is transformed into the Fourier spectral space, and the resulting two-dimensional equations in the r-theta plane for the Fourier coefficients are solved by finite differencing. The solver shows an extremely fast computing speed, e.g., the computation for a magnetogram with a resolution of 180(theta)x360(I center dot) is completed in less than 2 s. Even on a high-resolution 600x1200 grid, the solution can be obtained within only about one minute on a single CPU. The solver can potentially be applied directly to the original resolution of observed magnetograms from SDO/HMI for routinely analyzing daily full-disk data. |
| 英文摘要 | We present a fast solver for computing potential and linear force-free fields (LFFF) above the full solar disk with a synoptic magnetic map as input. The global potential field and the LFFF are dealt with in a unified way by solving a three-dimensional Helmholtz equation in a spherical shell and a two-dimensional Poisson equation on the solar surface. The solver is based on a combination of the spectral method and the finite-difference scheme. In the longitudinal direction the equation is transformed into the Fourier spectral space, and the resulting two-dimensional equations in the r-theta plane for the Fourier coefficients are solved by finite differencing. The solver shows an extremely fast computing speed, e.g., the computation for a magnetogram with a resolution of 180(theta)x360(I center dot) is completed in less than 2 s. Even on a high-resolution 600x1200 grid, the solution can be obtained within only about one minute on a single CPU. The solver can potentially be applied directly to the original resolution of observed magnetograms from SDO/HMI for routinely analyzing daily full-disk data. |
| 学科主题 | 空间物理 |
| 资助信息 | 973 program [2012CB825601]; Chinese Academy of Sciences [KZZD-EW-01-4]; National Natural Science Foundation of China [41031066, 40921063, 40890162, 41074122]; Specialized Research Fund for State Key Laboratories |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3249]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Jiang, Chaowei,Feng, Xueshang. A Unified and Very Fast Way for Computing the Global Potential and Linear Force-Free Fields[J]. SOLAR PHYSICS,2012,281(2):621-637. |
| APA | Jiang, Chaowei,&Feng, Xueshang.(2012).A Unified and Very Fast Way for Computing the Global Potential and Linear Force-Free Fields.SOLAR PHYSICS,281(2),621-637. |
| MLA | Jiang, Chaowei,et al."A Unified and Very Fast Way for Computing the Global Potential and Linear Force-Free Fields".SOLAR PHYSICS 281.2(2012):621-637. |
入库方式： OAI收割
来源：国家空间科学中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。