Magnetic Helicity Estimations in Models and Observations of the Solar Magnetic Field. Part I: Finite Volume Methods
文献类型：期刊论文
| 作者 | Valori, Gherardo1; Pariat, Etienne2; Anfinogentov, Sergey3; Chen, Feng4; Georgoulis, Manolis K.5; Guo, Yang6; Liu, Yang7; Moraitis, Kostas5; Thalmann, Julia K.8; Yang, Shangbin9
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| 刊名 | SPACE SCIENCE REVIEWS
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| 出版日期 | 2016-11-01 |
| 卷号 | 201期号:1-4页码:147-200 |
| 关键词 | Magnetic fields Methods: numerical Sun: surface magnetism Sun: corona |
| 英文摘要 | Magnetic helicity is a conserved quantity of ideal magneto-hydrodynamics characterized by an inverse turbulent cascade. Accordingly, it is often invoked as one of the basic physical quantities driving the generation and structuring of magnetic fields in a variety of astrophysical and laboratory plasmas. We provide here the first systematic comparison of six existing methods for the estimation of the helicity of magnetic fields known in a finite volume. All such methods are reviewed, benchmarked, and compared with each other, and specifically tested for accuracy and sensitivity to errors. To that purpose, we consider four groups of numerical tests, ranging from solutions of the three-dimensional, force-free equilibrium, to magneto-hydrodynamical numerical simulations. Almost all methods are found to produce the same value of magnetic helicity within few percent in all tests. In the more solar-relevant and realistic of the tests employed here, the simulation of an eruptive flux rope, the spread in the computed values obtained by all but one method is only 3 %, indicating the reliability and mutual consistency of such methods in appropriate parameter ranges. However, methods show differences in the sensitivity to numerical resolution and to errors in the solenoidal property of the input fields. In addition to finite volume methods, we also briefly discuss a method that estimates helicity from the field lines' twist, and one that exploits the field's value at one boundary and a coronal minimal connectivity instead of a pre-defined three-dimensional magnetic-field solution. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | FORCE-FREE APPROXIMATION ; CORONAL MASS EJECTIONS ; ACTIVE-REGION ; RELATIVE-HELICITY ; FLUX ROPES ; ENERGY ; COMPUTATION ; EVOLUTION ; BUDGETS ; SIMULATIONS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000387767300004 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6846]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England 2.Univ Paris Diderot, UPMC Univ Paris 06, Sorbonne Univ, LESIA,Observ Paris,PSL Res Univ,CNRS,Sorbonne Par, F-92190 Meudon, France 3.Inst Solar Terr Phys SB RAS, POB 291,Lermontov St,126a, Irkutsk 664033, Russia 4.Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany 5.Acad Athens, Res Ctr Astron & Appl Math, 4 Soranou Efesiou St, Athens 11527, Greece 6.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China 7.Stanford Univ, HEPL Annex, B210, Stanford, CA 94305 USA 8.Graz Univ, Inst Phys IGAM, Univ Pl 5-2, A-8010 Graz, Austria 9.Chinese Acad Sci, Key Lab Solar Activ, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Valori, Gherardo,Pariat, Etienne,Anfinogentov, Sergey,et al. Magnetic Helicity Estimations in Models and Observations of the Solar Magnetic Field. Part I: Finite Volume Methods[J]. SPACE SCIENCE REVIEWS,2016,201(1-4):147-200. |
| APA | Valori, Gherardo.,Pariat, Etienne.,Anfinogentov, Sergey.,Chen, Feng.,Georgoulis, Manolis K..,...&Yang, Shangbin.(2016).Magnetic Helicity Estimations in Models and Observations of the Solar Magnetic Field. Part I: Finite Volume Methods.SPACE SCIENCE REVIEWS,201(1-4),147-200. |
| MLA | Valori, Gherardo,et al."Magnetic Helicity Estimations in Models and Observations of the Solar Magnetic Field. Part I: Finite Volume Methods".SPACE SCIENCE REVIEWS 201.1-4(2016):147-200. |
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