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IMPULSIVE THERMAL X-RAY EMISSION FROM A LOW-LYING CORONAL LOOP
Liu, Siming1; Li, Youping1; Fletcher, Lyndsay2
2013-06-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume769Issue:2Pages:0
Corresponding AuthorLiu, SM (reprint author), Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China. Email: liusm@pmo.ac.cn
AbstractUnderstanding the relationship among different emission components plays an essential role in the study of particle acceleration and energy conversion in solar flares. In flares where gradual and impulsive emission components can be readily identified, the impulsive emission has been attributed to non-thermal particles. We carry out detailed analysis of H alpha and X-ray observations of a GOES class B microflare loop on the solar disk. The impulsive hard X-ray emission, however, is found to be consistent with a hot, quasi-thermal origin, and there is little evidence of emission from chromospheric footpoints, which challenges conventional models of flares and reveals a class of microflares associated with dense loops. H alpha observations indicate that the loop lies very low in the solar corona or even in the chromosphere and both emission and absorption materials evolve during the flare. The enhanced H alpha emission may very well originate from the photosphere when the low-lying flare loop heats up the underlying chromosphere and reduces the corresponding H alpha opacity. These observations may be compared with detailed modeling of flare loops with the internal kink instability, where the mode remains confined in space without apparent change in the global field shape, to uncover the underlying physical processes and to probe the structure of solar atmosphere.
KeywordAcceleration Of Particles Magnetic Reconnection Opacity Radiation Mechanisms: Thermal Sun: Atmosphere Sun: Flares
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/769/2/135
WOS KeywordREGION TRANSIENT BRIGHTENINGS ; SOLAR-FLARES ; FREQUENCY-DISTRIBUTIONS ; PARTICLE-ACCELERATION ; KINK INSTABILITY ; ENERGY-RELEASE ; RECONNECTION ; RHESSI ; HARD ; MICROWAVE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000319999100051
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9862
Collection太阳高能及相关物理过程研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China
2.Univ Glasgow, SUPA Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
Recommended Citation
GB/T 7714
Liu, Siming,Li, Youping,Fletcher, Lyndsay. IMPULSIVE THERMAL X-RAY EMISSION FROM A LOW-LYING CORONAL LOOP[J]. ASTROPHYSICAL JOURNAL,2013,769(2):0.
APA Liu, Siming,Li, Youping,&Fletcher, Lyndsay.(2013).IMPULSIVE THERMAL X-RAY EMISSION FROM A LOW-LYING CORONAL LOOP.ASTROPHYSICAL JOURNAL,769(2),0.
MLA Liu, Siming,et al."IMPULSIVE THERMAL X-RAY EMISSION FROM A LOW-LYING CORONAL LOOP".ASTROPHYSICAL JOURNAL 769.2(2013):0.
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