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The Response of the Ly alpha Line in Different Flare Heating Models
Hong, Jie1,2; Li, Ying3; Ding, M. D.1,2; Carlsson, Mats4,5
2019-07-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume879Issue:2Pages:10
Corresponding AuthorHong, Jie(jiehong@nju.edu.cn)
AbstractThe solar Ly alpha 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 Ly alpha 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 Ly alpha intensity light curve, a dip appears when the change of asymmetry occurs. In thermal models, the Ly alpha 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 Ly alpha 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
WOS KeywordLOOP RADIATIVE HYDRODYNAMICS ; SOLAR ; EMISSION ; SUMER
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000475773700002
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27106
Collection中国科学院紫金山天文台
Corresponding AuthorHong, Jie
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China
2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210034, Jiangsu, Peoples R China
4.Univ Oslo, Rosseland Ctr Solar Phys, POB 1029 Blindern, NO-0315 Oslo, Norway
5.Univ Oslo, Inst Theoret Astrophys, POB 1029 Blindern, NO-0315 Oslo, Norway
Recommended Citation
GB/T 7714
Hong, Jie,Li, Ying,Ding, M. D.,et al. The Response of the Ly alpha Line in Different Flare Heating Models[J]. ASTROPHYSICAL JOURNAL,2019,879(2):10.
APA Hong, Jie,Li, Ying,Ding, M. D.,&Carlsson, Mats.(2019).The Response of the Ly alpha Line in Different Flare Heating Models.ASTROPHYSICAL JOURNAL,879(2),10.
MLA Hong, Jie,et al."The Response of the Ly alpha Line in Different Flare Heating Models".ASTROPHYSICAL JOURNAL 879.2(2019):10.
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