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Solar flares with similar soft but different hard X-ray emissions: case and statistical studies
Sharykin, Ivan N.1; Struminsky, Alexei B.1; Zimovets, Ivan V.1; Gan, Wei-Qun2
2016
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume16Issue:1
AbstractFrom the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) catalog we select events which have approximately the same GOES class (high C - low M or 500-1200 counts s(-1) within the RHESSI 6-12 keV energy band), but with different maximal energies of detected hard X-rays. The selected events are subdivided into two groups: (1) flares with X-ray emissions observed by RHESSI up to only 50 keV and (2) flares with hard X-ray emission observed also above 50 keV. The main task is to understand observational peculiarities of these two flare groups. We use RHESSI X-ray data to obtain spectral and spatial information in order to find differences between selected groups. Spectra and images are analyzed in detail for six events (case study). For a larger number of samples (85 and 28 flares in the low-energy and high-energy groups respectively) we only make some generalizations. In spectral analysis we use the thick-target model for hard X-ray emission and one temperature assumption for thermal soft X-ray emission. RHESSI X-ray images are used for determination of flare region sizes. Although thermal and spatial properties of these two groups of flares are not easily distinguishable, power law indices of hard X-rays show significant differences. Events from the high-energy group generally have a harder spectrum. Therefore, the efficiency of chromospheric evaporation is not sensitive to the hardness of nonthermal electron spectra but rather depends on the total energy flux of nonthermal electrons.
KeywordSun: Flares Sun: X-rays Gamma Rays
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/1674-4527/16/1/005
WOS KeywordLOW-ENERGY CUTOFFS ; SPECTROSCOPIC-IMAGER ; ELECTRON-SPECTRA ; RHESSI ; EVENTS ; TEMPERATURES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000368088700005
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16114
Collection太阳高能及相关物理过程研究团组
Affiliation1.Russian Acad Sci, Space Res Inst, Moscow 117997, Russia
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Sharykin, Ivan N.,Struminsky, Alexei B.,Zimovets, Ivan V.,et al. Solar flares with similar soft but different hard X-ray emissions: case and statistical studies[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(1).
APA Sharykin, Ivan N.,Struminsky, Alexei B.,Zimovets, Ivan V.,&Gan, Wei-Qun.(2016).Solar flares with similar soft but different hard X-ray emissions: case and statistical studies.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(1).
MLA Sharykin, Ivan N.,et al."Solar flares with similar soft but different hard X-ray emissions: case and statistical studies".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.1(2016).
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