Synthetic Emissions of the Fe XXI 1354 angstrom Line from Flare Loops Experiencing Fundamental Fast Sausage Oscillations
文献类型：期刊论文
| 作者 | Shi, Mijie1,2; Li, Bo1; Huang, Zhenghua1; Chen, Shao-Xia1 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-03-20 |
| 卷号 | 874期号:1页码:12 |
| 关键词 | magnetohydrodynamics (MHD) Sun: corona Sun: UV radiation waves |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab07b8 |
| 英文摘要 | Inspired by recent IRIS observations, we forward model the response of the Fe XXI 1354 A line to fundamental, standing, linear fast sausage modes (FSMs) in flare loops. Starting with the fluid parameters for an FSM in a straight tube with equilibrium parameters largely compatible with the IRIS measurements, we synthesize the line profiles by incorporating the non-Equilibrium Ionization (NEI) effect in the computation of the contribution function. We find that both the intensity and Doppler shift oscillate at the wave period (P). The phase difference between the two differs from the expected value (90 degrees) only slightly because NEI plays only a marginal role in determining the ionic fraction of Fe XXI in the examined dense loop. The Doppler width modulations, however, posses an asymmetry in the first and second halves of a wave period, leading to a secondary periodicity at P/2 in addition to the primary one at P. This behavior results from the competition between the broadening due to bulk flow and that due to temperature variations, with the latter being stronger but not overwhelmingly so. These expected signatures, with the exception of the Doppler width, are largely consistent with the IRIS measurements, thereby corroborating the reported detection of a fundamental FSM. The forward-modeled signatures are useful for identifying fundamental FSMs in flare loops from measurements of the Fe XXI 1354 A line with instruments similar to IRIS, even though a much higher cadence is required for the expected behavior in the Doppler widths to be detected. |
| WOS关键词 | WAVE-PROPAGATION ; SOLAR ; PULSATIONS ; MODES ; LEAKY |
| 资助项目 | National Natural Science Foundation of China[41674172] ; National Natural Science Foundation of China[11761141002] ; National Natural Science Foundation of China[U1831112] ; National Natural Science Foundation of China[41604145] ; National Natural Science Foundation of China[41474149] ; Young Scholar Program of Shandong University Weihai[2017WHWLJH07] ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China[KLSA201908] ; Open Research Program of the Key Laboratory of Solar Activity of National Astronomical Observatories of China[KLSA201801] ; International Space Science Institute Beijing (ISSI-BJ) |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000462738400005 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; 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 ; International Space Science Institute Beijing (ISSI-BJ) ; International Space Science Institute Beijing (ISSI-BJ) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 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 ; International Space Science Institute Beijing (ISSI-BJ) ; International Space Science Institute Beijing (ISSI-BJ) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 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 ; International Space Science Institute Beijing (ISSI-BJ) ; International Space Science Institute Beijing (ISSI-BJ) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; 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 ; International Space Science Institute Beijing (ISSI-BJ) ; International Space Science Institute Beijing (ISSI-BJ) |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/25765]  |
| 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, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China 2.Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shi, Mijie,Li, Bo,Huang, Zhenghua,et al. Synthetic Emissions of the Fe XXI 1354 angstrom Line from Flare Loops Experiencing Fundamental Fast Sausage Oscillations[J]. ASTROPHYSICAL JOURNAL,2019,874(1):12. |
| APA | Shi, Mijie,Li, Bo,Huang, Zhenghua,&Chen, Shao-Xia.(2019).Synthetic Emissions of the Fe XXI 1354 angstrom Line from Flare Loops Experiencing Fundamental Fast Sausage Oscillations.ASTROPHYSICAL JOURNAL,874(1),12. |
| MLA | Shi, Mijie,et al."Synthetic Emissions of the Fe XXI 1354 angstrom Line from Flare Loops Experiencing Fundamental Fast Sausage Oscillations".ASTROPHYSICAL JOURNAL 874.1(2019):12. |
入库方式： OAI收割
来源：国家天文台
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