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A statistical study of the resonance line of Ca XIX observed with Yohkoh Bragg crystal spectrometer
Gan, WQ ; Watanabe, T
1997
Source PublicationSOLAR PHYSICS
ISSN0038-0938
Volume174Issue:40910Pages:403—412
AbstractUsing the observational data of a Bragg crystal spectrometer on Yohkoh for the period from October 1991 to the end of 1995, we have made a statistical study of flares which consist of a single loop or are dominated by a single loop in SXT images. A total of 158 flares are sampled. With a temporal resolution of three seconds, we conclude that although the blue asymmetry is Very common during the impulsive phase, the number of events with total blue shift is rather small, and only a very small number have a large total blue shift, contrasting with the predictions of some hydrodynamic models. Tt is also found that the blue shift for most flares appears at the early impulsive phase and is temporally correlated with the broadening of the line. These results demonstrate the necessity for checking whether chromospheric evaporation always occurs in solar flares.
KeywordSolar-flare Impulsive Phase Coronal Loop Diagnostics Plasma Atmospheres Emission Models
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8393
Collection太阳高能及相关物理过程研究团组
Recommended Citation
GB/T 7714
Gan, WQ,Watanabe, T. A statistical study of the resonance line of Ca XIX observed with Yohkoh Bragg crystal spectrometer[J]. SOLAR PHYSICS,1997,174(40910):403—412.
APA Gan, WQ,&Watanabe, T.(1997).A statistical study of the resonance line of Ca XIX observed with Yohkoh Bragg crystal spectrometer.SOLAR PHYSICS,174(40910),403—412.
MLA Gan, WQ,et al."A statistical study of the resonance line of Ca XIX observed with Yohkoh Bragg crystal spectrometer".SOLAR PHYSICS 174.40910(1997):403—412.
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