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A possible broadening mechanism of HeI 10 830 angstrom profiles observed in a limb flare
Li, H; You, J
2001-08-01
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN1432-0746
Volume374Issue:3Pages:1121-1126
AbstractThe He I 10 830 Angstrom spectra observed in the impulsive phase of the 2N/X20 solar limb are of 16 August 1989 show unusually broad profiles, and most of the profiles are blue-shifted and/or blue asymmetric with full-width-at-half-maximum (FWHM) greater than 10 Angstrom. Contrary to prominences, weak post-flare loops and surges, the observed profiles of the are cannot be simulated by Doppler broadening with a uniform flaring atmosphere model. Calculations show that only when the electron density is greater than 10(16) cm(-3) can Stark broadening produce an obvious in fence on the He I 10 830 Angstrom profile. This indicates that it is not plausible that Stark broadening leads to the observed profiles even though they can be fitted by Stark broadening. Alternatively, an expanding flaring atmosphere can perfectly simulate all the observed He I 10 830 Angstrom profiles. The expanding velocities are generally several tens of km s(-1) and that corresponding to the widest profile is greater than 120 km s(-1). Expanding velocity and other parameters vary with time and the observed area. This expanding flaring atmosphere model is a perspective candidate for line broadening. It is an indication of the lateral expansion resulting from rapid chromospheric heating in addition to the upward evaporation and downward condensation.
KeywordSun : Flares Sun : Infrared Line : Profiles
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1051/0004-6361:20010802
WOS KeywordCHROMOSPHERIC EVAPORATION ; IMPULSIVE PHASE ; SOLAR-FLARES ; SPECTRA ; BEAM
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000170215900035
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8195
Collection太阳高能及相关物理过程研究团组
AffiliationAcad Sinica, Purple Mt Observ, Natl Astron Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Li, H,You, J. A possible broadening mechanism of HeI 10 830 angstrom profiles observed in a limb flare[J]. ASTRONOMY & ASTROPHYSICS,2001,374(3):1121-1126.
APA Li, H,&You, J.(2001).A possible broadening mechanism of HeI 10 830 angstrom profiles observed in a limb flare.ASTRONOMY & ASTROPHYSICS,374(3),1121-1126.
MLA Li, H,et al."A possible broadening mechanism of HeI 10 830 angstrom profiles observed in a limb flare".ASTRONOMY & ASTROPHYSICS 374.3(2001):1121-1126.
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