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Redshift of the Ca XIX resonance line in solar flares observed with Yohkoh Bragg crystal spectrometer
Gan, WQ
1998-11-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume508Issue:1Pages:418-422
AbstractAmong a total of 158 flares in which the soft X-ray morphologies present a single loop or a single-loop-dominated structure, about 16% show a redshift in the Ca XIX resonance line. The number distribution of redshifted events on the solar disk exhibits a limb-increasing tendency. Having analyzed the implications of redshifts, we find only seven events in which the redshifts may marginally be the result of mass downflows along the loop, while the redshifts in the other events can be explained either by the model of chromospheric evaporation or by the contribution of satellite lines to the resonance line. For the events with redshifts manifesting the downflows, the redshift takes place mainly in the wing of the line, the redshift appears just at the beginning of the rising phase, and the duration of the redshift is from less than 10 s to several tens of seconds. These downflows may be related to the thermal energy release in the loop with a high initial coronal density.
KeywordSun : Corona Sun : Flares Sun : X-Rays, Gamma Rays
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordHYDRODYNAMIC MODEL ; LOOP ; DIAGNOSTICS ; PHASE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000077780000034
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8340
Collection太阳高能及相关物理过程研究团组
Affiliation1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Natl Astron Ctr, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Gan, WQ. Redshift of the Ca XIX resonance line in solar flares observed with Yohkoh Bragg crystal spectrometer[J]. ASTROPHYSICAL JOURNAL,1998,508(1):418-422.
APA Gan, WQ.(1998).Redshift of the Ca XIX resonance line in solar flares observed with Yohkoh Bragg crystal spectrometer.ASTROPHYSICAL JOURNAL,508(1),418-422.
MLA Gan, WQ."Redshift of the Ca XIX resonance line in solar flares observed with Yohkoh Bragg crystal spectrometer".ASTROPHYSICAL JOURNAL 508.1(1998):418-422.
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