OBSERVATIONS AND NONLINEAR FORCE-FREE FIELD MODELING OF ACTIVE REGION 10953
文献类型：期刊论文
| 作者 | Su, Yingna1,2 ; van Ballegooijen, Adriaan1; Lites, Bruce W.3; Deluca, Edward E.1; Golub, Leon1; Grigis, Paolo C.1; Huang, Guangli2; Ji, Haisheng2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2009-01-20 |
| 卷号 | 691期号:1页码:105-114 |
| 关键词 | Sun: corona Sun: filaments Sun: flares Sun: magnetic fields Sun: photosphere Sun: X-rays, gamma rays |
| ISSN号 | 0004-637X |
| 英文摘要 | We present multiwavelength observations of a simple bipolar active region (NOAA 10953), which produced several small flares ( mostly B class and one C8.5 class) and filament activations from April 30 to May 3 in 2007. We also explore nonlinear force-free field (NLFFF) modeling of this region prior to the C8.5 flare on May 2, using magnetograph data from SOHO/MDI and Hinode/SOT. A series of NLFFF models are constructed using the flux-rope insertion method. By comparing the modeled field lines with multiple X-ray loops observed by Hinode/XRT, we find that the axial flux of the flux rope in the best-fit models is ( 7 +/- 2) x 10(20) Mx, while the poloidal flux has a wider range of (0.1-10) x 10(10) Mx cm(-1). The axial flux in the best-fit model is well below the upper limit (similar to 15 x 10(20) Mx) for stable force-free configurations, which is consistent with the fact that no successful full filament eruption occurred in this active region. From multiwavelength observations of the C8.5 flare, we find that the X-ray brightenings ( in both RHESSI and XRT) appeared about 20 minutes earlier than the EUV brightenings seen in TRACE 171 angstrom images and filament activations seen in MLSO H alpha images. This is interpreted as an indication that the X-ray emission may be caused by direct coronal heating due to reconnection, and the energy transported down to the chromosphere may be too low to produce EUV brightenings. This flare started from nearly unsheared flare loop, unlike most two-ribbon flares that begin with highly sheared footpoint brightenings. By comparing with our NLFFF model, we find that the early flare loop is located above the flux rope that has a sharp boundary. We suggest that this flare started near the outer edge of the flux rope, not at the inner side or at the bottom as in the standard two-ribbon flare model. |
| 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] | CORONAL MAGNETIC-FIELDS ; STOKES PROFILE ANALYSIS ; VECTOR MAGNETOGRAPH DATA ; HINODE MISSION ; SOLAR CORONA ; FLUX ROPES ; FLARE ; RECONSTRUCTION ; CANCELLATION ; PHOTOSPHERE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000263196600011 |
| 公开日期 | 2011-12-08 |
| 源URL | [http://159.226.72.40/handle/332002/1507]  |
| 专题 | 紫金山天文台_太阳高能及相关物理过程研究团组 |
| 作者单位 | 1.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 2.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China 3.High Altitude Observ, Boulder, CO 80307 USA |
| 推荐引用方式 GB/T 7714 | Su, Yingna,van Ballegooijen, Adriaan,Lites, Bruce W.,et al. OBSERVATIONS AND NONLINEAR FORCE-FREE FIELD MODELING OF ACTIVE REGION 10953[J]. ASTROPHYSICAL JOURNAL,2009,691(1):105-114. |
| APA | Su, Yingna.,van Ballegooijen, Adriaan.,Lites, Bruce W..,Deluca, Edward E..,Golub, Leon.,...&Ji, Haisheng.(2009).OBSERVATIONS AND NONLINEAR FORCE-FREE FIELD MODELING OF ACTIVE REGION 10953.ASTROPHYSICAL JOURNAL,691(1),105-114. |
| MLA | Su, Yingna,et al."OBSERVATIONS AND NONLINEAR FORCE-FREE FIELD MODELING OF ACTIVE REGION 10953".ASTROPHYSICAL JOURNAL 691.1(2009):105-114. |
入库方式： OAI收割
来源：紫金山天文台
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