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A new and fast way to reconstruct a nonlinear force-free field in the solar corona
Song, M. T.; Fang, C.; Tang, Y. H.; Wu, S. T.; Zhang, Y. A.
2006-10-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume649Issue:2Pages:1084-1092
AbstractWe reexamine the method of upward integration of a nonlinear force-free field (NFFF), which is, as is well known, an ill-posed problem. It can be modified to a well-posed one by the following means: instead of using finite difference to express partial derivatives, we use smooth continuous functions to approach magnetic field values, write down three field components consisting of amplitude functions multiplying morphology functions, and reduce four basic NFFF equations to ordinary differential ones. They are then solved in an asymptotic manner (zeroth-order, first-order, etc.). Considering the physical meaning of alpha, we found a self-consistent compatibility condition for the boundary values. Furthermore, a computation algorithm is proposed, similar to the usual time-dependent two-dimensional MHD simulation scheme. This algorithm is steady and robust against the noise in the magnetic field ( in particular, the transverse field) measurement and is able to deal with concentrated photospheric currents. The algorithm runs very fast on an ordinary PC and lasts only 6 minutes for the 80 x 60 (x x y) mesh up to a height of 80 (=216,000 km similar to 0.3 R-circle dot). So it provides a powerful tool for solar scientists to analyze the magnetic field properties of solar active regions and to make predictions of solar activity.
KeywordMhd Sun : Corona Sun : Magnetic Fields
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordFREE MAGNETIC-FIELD ; VECTOR MAGNETOGRAPH DATA ; NON-CONSTANT-ALPHA ; COMPUTATION ; CODE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000240854200047
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/3584
Collection太阳高能及相关物理过程研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
3.Univ Alabama, Ctr Space Plasma & Aeron Res, Huntsville, AL 35899 USA
4.Univ Alabama, Dept Mech & Aerosp Engn, Huntsville, AL 35899 USA
Recommended Citation
GB/T 7714
Song, M. T.,Fang, C.,Tang, Y. H.,et al. A new and fast way to reconstruct a nonlinear force-free field in the solar corona[J]. ASTROPHYSICAL JOURNAL,2006,649(2):1084-1092.
APA Song, M. T.,Fang, C.,Tang, Y. H.,Wu, S. T.,&Zhang, Y. A..(2006).A new and fast way to reconstruct a nonlinear force-free field in the solar corona.ASTROPHYSICAL JOURNAL,649(2),1084-1092.
MLA Song, M. T.,et al."A new and fast way to reconstruct a nonlinear force-free field in the solar corona".ASTROPHYSICAL JOURNAL 649.2(2006):1084-1092.
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