PMO OpenIR  > 太阳高能及相关物理过程研究团组
Impulsive phase He 10830 spectra of a large solar limb flare of 16 August 1989
You, JQ; Wang, CJ; Fan, ZY; Li, H
1998-10-01
Source PublicationSOLAR PHYSICS
ISSN0038-0938
Volume182Issue:2Pages:431-446
AbstractWe obtained simultaneously He I 10830 Angstrom spectra, H alpha filtergrams and microwave data of a large limb hare (2N/X20) in 1989. In this paper we characterize He I 10830 spectra in I-elation to the impulsive phase. All the He I 10830 spectra, except those of the surge, show blue shift or blue asymmetry. The velocities inferred from the spectra range from a few to 160 km s(-1), implying that the horizontal motion is very likely present in the structure of this flare at different heights. The He I 10830 profiles of a flare are relatively broad and cannot be simulated by the Doppler broadening mechanism with a uniform flare model atmosphere. It is most likely that these characteristics are related to rapid and localized heating in the low and middle chromosphere. Comparing the SXR and microwave data with the optical data leads to the following scenario: the corona was already heated to some extent before the Bare onset, and in the first 2 minutes of the impulsive phase, heat conduction was the main source or, at least, a competitive source, for chromospheric heating. However, the impulsive event, associated with the unusually broadened He I 10830 line (Delta lambda(f) > 20 Angstrom) and temporally correlated with a microwave burst, is probably caused by electron-beam hearing.
KeywordAsymmetry Emission Line
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordASYMMETRY ; EMISSION ; LINE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000077322300010
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8341
Collection太阳高能及相关物理过程研究团组
AffiliationAcad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
You, JQ,Wang, CJ,Fan, ZY,et al. Impulsive phase He 10830 spectra of a large solar limb flare of 16 August 1989[J]. SOLAR PHYSICS,1998,182(2):431-446.
APA You, JQ,Wang, CJ,Fan, ZY,&Li, H.(1998).Impulsive phase He 10830 spectra of a large solar limb flare of 16 August 1989.SOLAR PHYSICS,182(2),431-446.
MLA You, JQ,et al."Impulsive phase He 10830 spectra of a large solar limb flare of 16 August 1989".SOLAR PHYSICS 182.2(1998):431-446.
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