Parametric Evolution of Power-law Energy Spectra of Flare Accelerated Electrons in the Solar Atmosphere

doi:10.3847/1538-4357/abc2ca

	Parametric Evolution of Power-law Energy Spectra of Flare Accelerated Electrons in the Solar Atmosphere
	Tang, J. F.1,3,4; Wu, D. J.4; Chen, L.4; Xu, L.2; Tan, B. L.3
刊名	ASTROPHYSICAL JOURNAL
	2020-11-01
卷号	904 期号:1 页码:1
关键词	Spectral energy distribution Solar x-ray flares Solar coronal loops Solar energetic particles
ISSN号	0004-637X
DOI	10.3847/1538-4357/abc2ca
产权排序	1
英文摘要	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.
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资助项目	NSFC[11673055] ; NSFC[41531071] ; NSFC[11873018] ; NSFC[11773601] ; Tianshan Youth[2017Q401] ; Key Laboratory of Solar Activity at National Astronomical Observatories, CAS ; [2018-XBQNXZ-A-009]
WOS关键词	HARD X-RAY ; PARTICLE-ACCELERATION ; NONTHERMAL ELECTRONS ; IMPULSIVE PHASE ; EMISSION ; TARGET ; IONIZATION ; RADIO ; BEAMS ; BREMSSTRAHLUNG
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000590134400001
资助机构	NSFC ; Tianshan Youth ; Key Laboratory of Solar Activity at National Astronomical Observatories, CAS
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/3719]
专题	太阳物理研究室
通讯作者	Tang, J. F.; Wu, D. J.
作者单位	1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 2.Shangrao Normal Univ, Sch Phys & Elect Informat, Shangrao 334001, Peoples R China 3.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China 4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 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]. ASTROPHYSICAL JOURNAL,2020,904(1):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.ASTROPHYSICAL JOURNAL,904(1),1.
MLA	Tang, J. F.,et al."Parametric Evolution of Power-law Energy Spectra of Flare Accelerated Electrons in the Solar Atmosphere".ASTROPHYSICAL JOURNAL 904.1(2020):1.