ATOMIC-LEVEL PSEUDO-DEGENERACY OF ATOMIC LEVELS GIVING TRANSITIONS INDUCED BY MAGNETIC FIELDS, OF IMPORTANCE FOR DETERMINING THE FIELD STRENGTHS IN THE SOLAR CORONA
文献类型：期刊论文
| 作者 | Li, Wenxian1,2; Yang, Yang1,2; Tu, Bingsheng1,2; Xiao, Jun1,2; Grumer, Jon3; Brage, Tomas3; Watanabe, Tetsuya4; Hutton, Roger1,2; Zou, Yaming1,2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2016-08-01 |
| 卷号 | 826页码:4 |
| 关键词 | atomic processes magnetic fields Sun: corona techniques: spectroscopic UV radiation |
| ISSN号 | 0004-637X |
| DOI | 10.3847/0004-637X/826/2/219 |
| 英文摘要 | We present a measured value for the degree of pseudo-degeneracy between two fine-structure levels in Fe9+ from line intensity ratios involving a transition induced by an external magnetic field. The extracted fine-structure energy difference between the 3p(4)3d D-4(5/2) and D-4(7/2) levels, where the latter is the upper state for the magnetic-field induced line, is needed in our recently proposed method to measure magnetic-field strengths in the solar corona. The intensity of the 3p(4)3d D-4(7/2) -> 3p(5) P-2(3/2) line at 257.262 angstrom is sensitive to the magnetic field external to the ion. This sensitivity is in turn strongly dependent on the energy separation in the pseudo-degeneracy through the mixing induced by the external magnetic field. Our measurement, which uses an Electron Beam Ion Trap with a known magnetic-field strength, indicates that this energy difference is 3.5 cm(-1). The high abundance of Fe9+ and the sensitivity of the line's transition probability to field strengths below 0.1 T opens up the possibility of diagnosing coronal magnetic fields. We propose a new method to measure the magnetic field in the solar corona, from similar intensity ratios in Fe9+. In addition, the proposed method to use the line ratio of the blended line 3p(4)3d D-4(7/2,5/2) -> 3p(5) P-2(3/2) with another line from Fe X as the density diagnostic should evaluate the effect of the magnetic-field-induced transition line. |
| WOS关键词 | IMAGING SPECTROMETER ; ACTIVE-REGION ; TEMPERATURE ; HINODE ; LINES |
| 资助项目 | Chinese National Fusion Project[2015GB117000] ; Shanghai Leading Academic Discipline Project[B107] ; Swedish Institute under the Visby programme |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000381977900119 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | Chinese National Fusion Project ; Shanghai Leading Academic Discipline Project ; Swedish Institute under the Visby programme |
| 源URL | [http://119.78.100.186/handle/113462/43321]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Brage, Tomas |
| 作者单位 | 1.Minist Educ, Key Lab Appl Ion Beam Phys, Beijing, Peoples R China 2.Fudan Univ, Shanghai EBIT Lab, Inst Modern Phys, Shanghai, Peoples R China 3.Lund Univ, Div Math Phys, Dept Phys, S-22100 Lund, Sweden 4.NAOJ, Tokyo, Japan |
| 推荐引用方式 GB/T 7714 | Li, Wenxian,Yang, Yang,Tu, Bingsheng,et al. ATOMIC-LEVEL PSEUDO-DEGENERACY OF ATOMIC LEVELS GIVING TRANSITIONS INDUCED BY MAGNETIC FIELDS, OF IMPORTANCE FOR DETERMINING THE FIELD STRENGTHS IN THE SOLAR CORONA[J]. ASTROPHYSICAL JOURNAL,2016,826:4. |
| APA | Li, Wenxian.,Yang, Yang.,Tu, Bingsheng.,Xiao, Jun.,Grumer, Jon.,...&Zou, Yaming.(2016).ATOMIC-LEVEL PSEUDO-DEGENERACY OF ATOMIC LEVELS GIVING TRANSITIONS INDUCED BY MAGNETIC FIELDS, OF IMPORTANCE FOR DETERMINING THE FIELD STRENGTHS IN THE SOLAR CORONA.ASTROPHYSICAL JOURNAL,826,4. |
| MLA | Li, Wenxian,et al."ATOMIC-LEVEL PSEUDO-DEGENERACY OF ATOMIC LEVELS GIVING TRANSITIONS INDUCED BY MAGNETIC FIELDS, OF IMPORTANCE FOR DETERMINING THE FIELD STRENGTHS IN THE SOLAR CORONA".ASTROPHYSICAL JOURNAL 826(2016):4. |
入库方式： OAI收割
来源：近代物理研究所
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