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The Response of the Lyα Line in Different Flare Heating Models
Hong,Jie1,2; Li,Ying3; Ding,M. D.1,2; Carlsson,Mats4,5
2019-07-16
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume879Issue:2
AbstractAbstract The solar Lyα line is the strongest line in the ultraviolet waveband, and is greatly enhanced during solar flares. Here we present radiative hydrodynamic simulations of solar flares under different heating models, and calculate the response of this line taking into account nonequilibrium ionization of hydrogen and partial frequency redistribution. We find that in nonthermal heating models, the Lyα line can show a red or blue asymmetry corresponding to the chromospheric evaporation or condensation, respectively. The asymmetry may change from red to blue if the electron beam flux is large enough to produce a significant chromospheric condensation region. In the Lyα intensity light curve, a dip appears when the change of asymmetry occurs. In thermal models, the Lyα line intensity peaks quickly and then falls, and the profile has an overall red asymmetry, which is similar to the profiles from heating by a soft electron beam. The Lyα profile shows a single red peak at the end of thermal heating, and the whole line is formed in a very small height range.
Keywordline: profiles radiative transfer Sun: chromosphere Sun: flares
DOI10.3847/1538-4357/ab262e
Language英语
WOS IDIOP:0004-637X-879-2-ab262e
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27474
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; jiehong@nju.edu.cn, 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,Li,Ying,Ding,M. D.,et al. The Response of the Lyα Line in Different Flare Heating Models[J]. The Astrophysical Journal,2019,879(2).
APA Hong,Jie,Li,Ying,Ding,M. D.,&Carlsson,Mats.(2019).The Response of the Lyα Line in Different Flare Heating Models.The Astrophysical Journal,879(2).
MLA Hong,Jie,et al."The Response of the Lyα Line in Different Flare Heating Models".The Astrophysical Journal 879.2(2019).
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