DOUBLE POWER-LAW DISTRIBUTION OF MAGNETIC ENERGY IN THE SOLAR CORONA OVER AN ACTIVE REGION
文献类型：期刊论文
| 作者 | Shen, Jinhua1,2,3; Ji, Haisheng1 ; Wiegelmann, Thomas2; Inhester, Bernd2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2013-02-10 |
| 卷号 | 764期号:1页码:86-86 |
| 关键词 | Sun: corona Sun: flares Sun: magnetic topology |
| ISSN号 | 0004-637X |
| 通讯作者 | Shen, JH (reprint author), Purple Mt Observ, 2 W Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China. Email: 0 |
| 英文摘要 | In this paper, we study the magnetic energy (ME) structure contained in the solar corona over the active region NOAA 11158. The time period is chosen as from 0: 00 to 06: 00 UT on 2011 February 15, during which an X-class flare occurred. The nonlinear force-free field (NLFFF) and the potential field extrapolation are carried out to model the coronal magnetic field over this active region, using high-quality photospheric vector magnetograms observed by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory as boundary conditions. We find that the volume distribution for the density of the ME (B-2/8 pi) and the ohmic dissipation power (ODP, j(2)/sigma), in which j is the electric current density (c/4 pi del x B) and sigma is the conductivity in the corona, can be readily fitted by a broken-down double-power law. The turn-over density for the spectrum of the ME and ODP is found to be fixed at similar to 1.0 x 10(4) erg cm(-3) and similar to 2.0 x 10(-15) W cm(-3) (assuming sigma = 10(5) Omega(-1) m(-1)), respectively. Compared with their first power-law spectra (fitted below the corresponding turn-over value) which remain unchanged, the second power-law spectra (fitted above the corresponding turn-over value) for the NLFFF's ME and ODP show flare-associated changes. The potential field remains steady. These results indicate that a magnetic field with energy density larger than the turn-over energy density plays a dominant role in powering the flare. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | X-CLASS FLARES ; ELECTRIC-CURRENTS ; VECTOR MAGNETOGRAMS ; FIELDS ; EVOLUTION ; AMBIGUITY ; RECONSTRUCTION ; MORPHOLOGY ; OCTOBER ; SHEAR |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000314335200086 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9950]  |
| 专题 | 紫金山天文台_太阳活动的多波段观测研究团组 |
| 作者单位 | 1.Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 2.Max Planck Inst Sonnensyst Forsch, D-37191 Katlenburg Lindau, Germany 3.Chinese Acad Sci, Grad Sch, Beijing 100864, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shen, Jinhua,Ji, Haisheng,Wiegelmann, Thomas,et al. DOUBLE POWER-LAW DISTRIBUTION OF MAGNETIC ENERGY IN THE SOLAR CORONA OVER AN ACTIVE REGION[J]. ASTROPHYSICAL JOURNAL,2013,764(1):86-86. |
| APA | Shen, Jinhua,Ji, Haisheng,Wiegelmann, Thomas,&Inhester, Bernd.(2013).DOUBLE POWER-LAW DISTRIBUTION OF MAGNETIC ENERGY IN THE SOLAR CORONA OVER AN ACTIVE REGION.ASTROPHYSICAL JOURNAL,764(1),86-86. |
| MLA | Shen, Jinhua,et al."DOUBLE POWER-LAW DISTRIBUTION OF MAGNETIC ENERGY IN THE SOLAR CORONA OVER AN ACTIVE REGION".ASTROPHYSICAL JOURNAL 764.1(2013):86-86. |
入库方式： OAI收割
来源：紫金山天文台
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