PMO OpenIR
Broken-up spectra of the loop-top hard X-ray source during a solar limb flare
Ning, Hao1,2; Chen, Yao1,2; Lee, Jeongwoo1,2; Wu, Zhao1,2; Su, Yang3; Kong, Xiang-Liang1,2
2019-12-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume19Issue:12Pages:10
Corresponding AuthorChen, Yao(yaochen@sdu.edu.cn)
AbstractSolar hard X-rays (HXRs) appear in the form of either footpoint sources or coronal sources. Each individual source provides its own critical information on acceleration of nonthermal electrons and plasma heating. Earlier studies found that the HXR emission in some events manifests a broken-up power-law spectrum, with the break energy around a few hundred keV based on spatially-integrated spectral analysis, and it does not distinguish the contributions from individual sources. In this paper, we report on the broken-up spectra of a coronal source studied using HXR data recorded by Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) during the SOL2017-09-10T16:06 (GOES class X8.2) flare. The flare occurred behind the western limb and its footpoint sources were mostly occulted by the disk. We could clearly identify such broken-up spectra pertaining solely to the coronal source during the flare peak time and after. Since a significant pileup effect on the RHESSI spectra is expected for this intense solar flare, we have selected the pileup correction factor, p = 2. In this case, we found the resulting RHESSI temperature (similar to 30 MK) to be similar to the GOES soft X-ray temperature and break energies of 45-60 keV. Above the break energy, the spectrum hardens with time from spectral index of 3.4 to 2.7, and the difference in spectral indices below and above the break energy increases from 1.5 to 5 with time. However, we note that when p = 2 is assumed, a single power-law fitting is also possible with the RHESSI temperature higher than the GOES temperature by similar to 10 MK. Possible scenarios for the broken-up spectra of the loop-top HXR source are briefly discussed.
Keywordacceleration of particles Sun: corona Sun: flares Sun: UV radiation Sun: X-rays gamma rays
DOI10.1088/1674-4527/19/12/173
WOS KeywordSTOCHASTIC ACCELERATION ; MAGNETIC RECONNECTION ; BREMSSTRAHLUNG ; MICROWAVE ; ELECTRONS ; EVOLUTION ; EMISSIONS ; CONTINUUM ; BURSTS ; MODEL
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000507468700005
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35492
Collection中国科学院紫金山天文台
Corresponding AuthorChen, Yao
Affiliation1.Shandong Univ, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China
2.Shandong Univ, Inst Space Sci, Weihai 264209, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Ning, Hao,Chen, Yao,Lee, Jeongwoo,et al. Broken-up spectra of the loop-top hard X-ray source during a solar limb flare[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2019,19(12):10.
APA Ning, Hao,Chen, Yao,Lee, Jeongwoo,Wu, Zhao,Su, Yang,&Kong, Xiang-Liang.(2019).Broken-up spectra of the loop-top hard X-ray source during a solar limb flare.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,19(12),10.
MLA Ning, Hao,et al."Broken-up spectra of the loop-top hard X-ray source during a solar limb flare".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 19.12(2019):10.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Ning, Hao]'s Articles
[Chen, Yao]'s Articles
[Lee, Jeongwoo]'s Articles
Baidu academic
Similar articles in Baidu academic
[Ning, Hao]'s Articles
[Chen, Yao]'s Articles
[Lee, Jeongwoo]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Ning, Hao]'s Articles
[Chen, Yao]'s Articles
[Lee, Jeongwoo]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.