Non-equilibrium Ionization Effects on Extreme-ultraviolet Emissions Modulated by Standing Sausage Modes in Coronal Loops
文献类型：期刊论文
| 作者 | Shi, Mijie1,2; Li, Bo1; Van Doorsselaere, Tom3; Chen, Shao-Xia1; Huang, Zhenghua1 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-01-10 |
| 卷号 | 870期号:2页码:10 |
| 关键词 | magnetohydrodynamics (MHD) Sun: corona Sun: UV radiation waves |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aaf393 |
| 英文摘要 | Forward-modeling the emission properties in various passbands is important for confidently identifying magnetohydrodynamic waves in the structured solar corona. We examine how non-equilibrium ionization (NEI) affects the extreme-ultraviolet (EUV) emissions modulated by standing fast sausage modes (FSMs) in coronal loops, taking the Fe IX 171 angstrom and Fe XII 193 angstrom emission lines as examples. Starting with the expressions for linear FSMs in straight cylinders, we synthesize the specific intensities and spectral profiles for the two spectral lines by incorporating the self-consistently derived ionic fractions in the relevant contribution functions. We find that relative to the case where equilibrium ionization (EI) is assumed, NEI considerably impacts the intensity modulations, but shows essentially no effect on the Doppler velocities or widths. Furthermore, NEI may affect the phase difference between intensity variations and those in Doppler widths for Fe XII 193 angstrom when the line of sight is oblique to the loop axis. While this difference is 180 degrees when EI is assumed, it is similar to 90 degrees when NEI is incorporated for the parameters we choose. We conclude that in addition to viewing angles and instrumental resolutions, NEI further complicates the detection of FSMs in spectroscopic measurements of coronal loops in the EUV passband. |
| WOS关键词 | OSCILLATIONS ; PULSATIONS ; WAVES ; PROPAGATION ; EUV |
| 资助项目 | National Natural Science Foundation of China[41474149] ; National Natural Science Foundation of China[41604145] ; National Natural Science Foundation of China[41674172] ; National Natural Science Foundation of China[11761141002] ; KU Leuven[GOA-2015-014] ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme[724326] ; Young Scholar Program of Shandong University Weihai[2017WHWLJH07] ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China[KLSA201801] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000455931200004 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; KU Leuven ; KU Leuven ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme ; Young Scholar Program of Shandong University Weihai ; Young Scholar Program of Shandong University Weihai ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; KU Leuven ; KU Leuven ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme ; Young Scholar Program of Shandong University Weihai ; Young Scholar Program of Shandong University Weihai ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; KU Leuven ; KU Leuven ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme ; Young Scholar Program of Shandong University Weihai ; Young Scholar Program of Shandong University Weihai ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; KU Leuven ; KU Leuven ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme ; European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme ; Young Scholar Program of Shandong University Weihai ; Young Scholar Program of Shandong University Weihai ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/24652]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Li, Bo |
| 作者单位 | 1.Shandong Univ, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Inst Space Sci, Weihai 264209, Peoples R China 2.Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100012, Peoples R China 3.Katholieke Univ Leuven, Dept Math, Ctr Math Plasma Astrophys, Celestijnenlaan 200B, B-3001 Leuven, Belgium |
| 推荐引用方式 GB/T 7714 | Shi, Mijie,Li, Bo,Van Doorsselaere, Tom,et al. Non-equilibrium Ionization Effects on Extreme-ultraviolet Emissions Modulated by Standing Sausage Modes in Coronal Loops[J]. ASTROPHYSICAL JOURNAL,2019,870(2):10. |
| APA | Shi, Mijie,Li, Bo,Van Doorsselaere, Tom,Chen, Shao-Xia,&Huang, Zhenghua.(2019).Non-equilibrium Ionization Effects on Extreme-ultraviolet Emissions Modulated by Standing Sausage Modes in Coronal Loops.ASTROPHYSICAL JOURNAL,870(2),10. |
| MLA | Shi, Mijie,et al."Non-equilibrium Ionization Effects on Extreme-ultraviolet Emissions Modulated by Standing Sausage Modes in Coronal Loops".ASTROPHYSICAL JOURNAL 870.2(2019):10. |
入库方式： OAI收割
来源：国家天文台
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