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Parametric Evolution of Power-law Energy Spectra of Flare Accelerated Electrons in the Solar Atmosphere
Tang,J. F.1,2,3; Wu,D. J.2; Chen,L.2; Xu,L.4; Tan,B. L.3
2020-11-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume904Issue:1
AbstractAbstract It is well known that solar hard X-ray bursts (HXRs) and solar radio bursts (SRBs) from solar flares both are produced directly by fast electron beams (FEBs) traveling through the solar atmosphere. The observed characteristics of HXRs and SRBs sensitively depend on the energy distribution of FEBs, which are believed commonly to have a power-law energy spectrum. When FEBs propagating in the solar atmosphere, however, their energy spectra can considerably vary due to the interaction with the atmospheric plasmas and this may significantly influence the observational characteristics of the producing HXRs and SRBs. In the present paper, based on flare atmospheric models, we investigate the parametric evolution of power-law spectra of FEBs due to their energy losses when propagating along flaring loops. The results show that an initially single power-law spectrum with a lower-energy cutoff can evolve into a more complex double power-law spectrum or a broken power-law spectrum with multi-breaking knees because of the dependence of the energy loss on the initial energies. The possible effects of the energy-spectral evolution of FEBs on observational characteristics of their HXR flares and SRBs are discussed. The present results are helpful to understand the physics of dynamical spectra of HXRs and SRBs from solar flares.
KeywordSpectral energy distribution Solar x-ray flares Solar coronal loops Solar energetic particles
DOI10.3847/1538-4357/abc2ca
Language英语
WOS IDIOP:0004-637X-904-1-abc2ca
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/62397
Collection中国科学院国家天文台
Corresponding AuthorTang,J. F.
Affiliation1.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi, Xinjiang 830011, People’s Republic of China; jftang@xao.ac.cn
2.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China; djwu@pmo.ac.cn
3.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
4.School of Physics and Electronic Information, Shangrao Normal University, Shangrao 334001, People’s Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Tang,J. F.,Wu,D. J.,Chen,L.,et al. Parametric Evolution of Power-law Energy Spectra of Flare Accelerated Electrons in the Solar Atmosphere[J]. The Astrophysical Journal,2020,904(1).
APA Tang,J. F.,Wu,D. J.,Chen,L.,Xu,L.,&Tan,B. L..(2020).Parametric Evolution of Power-law Energy Spectra of Flare Accelerated Electrons in the Solar Atmosphere.The Astrophysical Journal,904(1).
MLA Tang,J. F.,et al."Parametric Evolution of Power-law Energy Spectra of Flare Accelerated Electrons in the Solar Atmosphere".The Astrophysical Journal 904.1(2020).
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