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![]() | |
刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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2016 | |
卷号 | 16期号:1 |
关键词 | Sun: flares Sun: X-rays gamma rays |
英文摘要 | From 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. |
WOS标题词 | Science & Technology ; Physical Sciences |
类目[WOS] | Astronomy & Astrophysics |
研究领域[WOS] | Astronomy & Astrophysics |
关键词[WOS] | LOW-ENERGY CUTOFFS ; SPECTROSCOPIC-IMAGER ; ELECTRON-SPECTRA ; RHESSI ; EVENTS ; TEMPERATURES |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000368088700005 |
内容类型 | 期刊论文 |
源URL | [http://libir.pmo.ac.cn/handle/332002/16114] ![]() |
专题 | 紫金山天文台_太阳高能及相关物理过程研究团组 |
作者单位 | 1.Russian Acad Sci, Space Res Inst, Moscow 117997, Russia 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China |
推荐引用方式 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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