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THE ROLE OF CHROMOSPHERIC CONDENSATIONS IN THE CONTINUUM EMISSION OF WHITE-LIGHT FLARES
GAN, WQ; RIEGER, E; ZHANG, HQ; FANG, C
1992-10-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume397Issue:2Pages:694-700
AbstractConsiderable observational and theoretical evidence has shown the existence of chromospheric condensations in the flare process. The density within the condensation may be two orders of magnitude greater than that of the surroundings, and the downward velocity may be as large as 100 km s-1. In order to explore the possibility that the chromospheric condensations may be responsible for white-light flare emissions, we have studied the relations between the chromospheric condensation and the continuum emission by use of a non-LTE atmospheric modeling technique. The main results are as follows: the chromospheric condensation could produce the continuum enhancement only when it has a temperature of 9000 approximately 10,000 K and only when the transition region moves downward below to m > 10(-4) g cm-2; if the temperature within the condensation is equal to or lower than that of neighboring regions, the continuum is either not affected or even decreased; the role of the condensation in producing the continuum seems to be independent of the chromospheric state, that is, the results of introducing the condensation into either a heated chromosphere (corresponding to the nonthermal case) or a nonheated chromosphere (corresponding to the thermal case at the early phase) are nearly the same. When taking the quiet-Sun model as a background, the enhanced continuum exhibits usually a reddish distribution with a Balmer jump; while taking the penumbra model as a background, the calculated continuum enhancement may exhibit a flat or a bluish distribution with a Balmer jump. In this paper we also discuss the following topics: the physical meaning of the condensation with higher temperature; the wavelength distribution characteristics of continuum enhancements; the possible connection of the condensation with the deep layer heating of the photosphere; and the comparison of the condensation with the strong heated chromospheric model.
KeywordSun, Atmosphere Sun, Chromosphere Sun, Flares
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordLOOP RADIATIVE HYDRODYNAMICS ; SEMI-EMPIRICAL MODELS ; 1980 JULY 1 ; SOLAR-FLARES ; OPTICAL CONTINUUM ; ELECTRON-BEAM ; DYNAMICS ; SPECTRUM ; ORIGIN
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:A1992JQ07500034
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8545
Collection期刊(老文献)
Affiliation1.PURPLE MT OBSERV,NANJING,PEOPLES R CHINA
2.NANJING UNIV,DEPT ASTRON,NANJING,PEOPLES R CHINA
Recommended Citation
GB/T 7714
GAN, WQ,RIEGER, E,ZHANG, HQ,et al. THE ROLE OF CHROMOSPHERIC CONDENSATIONS IN THE CONTINUUM EMISSION OF WHITE-LIGHT FLARES[J]. ASTROPHYSICAL JOURNAL,1992,397(2):694-700.
APA GAN, WQ,RIEGER, E,ZHANG, HQ,&FANG, C.(1992).THE ROLE OF CHROMOSPHERIC CONDENSATIONS IN THE CONTINUUM EMISSION OF WHITE-LIGHT FLARES.ASTROPHYSICAL JOURNAL,397(2),694-700.
MLA GAN, WQ,et al."THE ROLE OF CHROMOSPHERIC CONDENSATIONS IN THE CONTINUUM EMISSION OF WHITE-LIGHT FLARES".ASTROPHYSICAL JOURNAL 397.2(1992):694-700.
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