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Non-LTE Calculations of the Fe i 6173 ??Line in a Flaring Atmosphere
Hong,Jie1,2; Ding,M. D.1,2; Li,Ying3; Carlsson,Mats4,5
2018-04-06
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume857Issue:1
AbstractAbstract The Fe i 6173 ? line is widely used in the measurements of vector magnetic fields by instruments including the Helioseismic and Magnetic Imager (HMI). We perform non-local thermodynamic equilibrium calculations of this line based on radiative hydrodynamic simulations in a flaring atmosphere. We employ both a quiet-Sun atmosphere and a penumbral atmosphere as the initial one in our simulations. We find that, in the quiet-Sun atmosphere, the line center is obviously enhanced during an intermediate flare. The enhanced emission is contributed from both radiative backwarming in the photosphere and particle beam heating in the lower chromosphere. A blue asymmetry of the line profile also appears due to an upward mass motion in the lower chromosphere. If we take a penumbral atmosphere as the initial atmosphere, the line has a more significant response to the flare heating, showing a central emission and an obvious asymmetry. The low spectral resolution of HMI would indicate some loss of information, but the enhancement and line asymmetry are still kept. By calculating polarized line profiles, we find that the Stokes I and V profiles can be altered as a result of flare heating. Thus the distortion of this line has a crucial influence on the magnetic field measured from this line, and one should be cautious in interpreting the magnetic transients observed frequently in solar flares.
Keywordline: profiles radiative transfer Sun: flares Sun: photosphere
DOI10.3847/2041-8213/aab9aa
Language英语
WOS IDIOP:2041-8205-857-1-aab9aa
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23508
Collection中国科学院紫金山天文台
Affiliation1.School of Astronomy and Space Science, Nanjing University, Nanjing 210023, People’s Republic of China; dmd@nju.edu.cn
2.Key Laboratory for Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, People’s Republic of China
3.Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210034, People’s Republic of China
4.Rosseland Centre for Solar Physics, University of Oslo, P.O. Box 1029 Blindern, NO-0315 Oslo, Norway
5.Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, NO-0315 Oslo, Norway
Recommended Citation
GB/T 7714
Hong,Jie,Ding,M. D.,Li,Ying,et al. Non-LTE Calculations of the Fe i 6173 ??Line in a Flaring Atmosphere[J]. The Astrophysical Journal Letters,2018,857(1).
APA Hong,Jie,Ding,M. D.,Li,Ying,&Carlsson,Mats.(2018).Non-LTE Calculations of the Fe i 6173 ??Line in a Flaring Atmosphere.The Astrophysical Journal Letters,857(1).
MLA Hong,Jie,et al."Non-LTE Calculations of the Fe i 6173 ??Line in a Flaring Atmosphere".The Astrophysical Journal Letters 857.1(2018).
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