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DIAGNOSTICS OF NONTHERMAL PROCESSES IN CHROMOSPHERIC FLARES .1. H-ALPHA AND CAII K-LINE PROFILES OF AN ATMOSPHERE BOMBARDED BY HECTA KEV ELECTRONS
FANG, C; HENOUX, JC; GAN, WQ
1993-07-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume274Issue:3Pages:917-922
AbstractThe significance of non-thermal excitation and ionization of hydrogen and CaII, by an electron beam, on the line profiles of Halpha and Call K line has been investigated. Non-LTE Halpha and CaII K line profiles have been calculated for the temperature distributions of semi-empirical flares models F1 and F2 (Machado et al. 1980). For reasonable values of the beam energy flux and power index, the hydrogen lines are greatly strengthened and broadened, and an obvious central reversal appears. The effects are weaker for the CaII K line. These effects can be used to diagnose electron beam bombardment during a solar flare, especially at its early phase. Any semi-empirical flare model that does not take into account non-thermal effects overestimates the heating of the solar atmosphere.
KeywordLine, Profiles Radiative Transfer Sun, Flares
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordWHITE-LIGHT FLARES ; SEMI-EMPIRICAL MODELS ; SOLAR-FLARES ; EXCITATION ; HYDROGEN ; IONIZATION ; TARGET ; POLARIZATION ; RADIATION ; LEVEL
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:A1993LP33400030
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8536
Collection期刊(老文献)
Affiliation1.OBSERV PARIS, DASOP, CNRS, URA326, F-92195 MEUDON, FRANCE
2.ACAD SINICA, PURPLE MT OBSERV, NANJING, PEOPLES R CHINA
3.NANJING UNIV, DEPT ASTRON, NANJING, PEOPLES R CHINA
Recommended Citation
GB/T 7714
FANG, C,HENOUX, JC,GAN, WQ. DIAGNOSTICS OF NONTHERMAL PROCESSES IN CHROMOSPHERIC FLARES .1. H-ALPHA AND CAII K-LINE PROFILES OF AN ATMOSPHERE BOMBARDED BY HECTA KEV ELECTRONS[J]. ASTRONOMY & ASTROPHYSICS,1993,274(3):917-922.
APA FANG, C,HENOUX, JC,&GAN, WQ.(1993).DIAGNOSTICS OF NONTHERMAL PROCESSES IN CHROMOSPHERIC FLARES .1. H-ALPHA AND CAII K-LINE PROFILES OF AN ATMOSPHERE BOMBARDED BY HECTA KEV ELECTRONS.ASTRONOMY & ASTROPHYSICS,274(3),917-922.
MLA FANG, C,et al."DIAGNOSTICS OF NONTHERMAL PROCESSES IN CHROMOSPHERIC FLARES .1. H-ALPHA AND CAII K-LINE PROFILES OF AN ATMOSPHERE BOMBARDED BY HECTA KEV ELECTRONS".ASTRONOMY & ASTROPHYSICS 274.3(1993):917-922.
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