PMO OpenIR  > 太阳高能及相关物理过程研究团组
RELATIONSHIP BETWEEN HARD AND SOFT X-RAY EMISSION COMPONENTS OF A SOLAR FLARE
Guo, Jingnan1,2,3; Liu, Siming1,3; Fletcher, Lyndsay1; Kontar, Eduard P.1
2011-02-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume728Issue:1Pages:4(12pp)
AbstractX-ray observations of solar flares routinely reveal an impulsive high-energy and a gradual low-energy emission component, whose relationship is one of the key issues of solar flare study. The gradual and impulsive emission components are believed to be associated with, respectively, the thermal and nonthermal components identified in spectral fitting. In this paper, a prominent similar to 50 s hard X-ray (HXR) pulse of a simple GOES class C7.5 flare on 2002 February 20 is used to study the association between high-energy, non-thermal, and impulsive evolution, and low-energy, thermal, and gradual evolution. We use regularized methods to obtain time derivatives of photon fluxes to quantify the time evolution as a function of photon energy, obtaining a break energy between impulsive and gradual behavior. These break energies are consistent with a constant value of similar to 11 keV in agreement with those found spectroscopically between thermal and non-thermal components, but the relative errors of the former are greater than 15% and much greater than the few percent errors found from the spectral fitting. These errors only weakly depend on assuming an underlying spectral model for the photons, pointing to the current data being inadequate to reduce the uncertainties rather than there being a problem associated with an assumed model. The time derivative method is used to test for the presence of a "pivot energy" in this flare. Although these pivot energies are marginally consistent with a constant value of similar to 9 keV, its values in the HXR rise phase appear to be lower than those in the decay phase. Assuming that electrons producing the high-energy component have a power-law distribution and are accelerated from relatively hot regions of a background plasma responsible for the observed thermal component, a low limit is obtained for the low-energy cutoff. This limit is always lower than the break and pivot energies and is located in the tail of the Maxwellian distribution of the thermal component.
KeywordRadiation Mechanisms: Non-thermal Radiation Mechanisms: Thermal Sun: Flares Sun: X-Rays, Gamma Rays
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/728/1/4
WOS KeywordENERGY-RELEASE EVENTS ; OF-FLIGHT DISTANCES ; PARTICLE-ACCELERATION ; SPECTRAL EVOLUTION ; ELECTRON ACCELERATION ; RHESSI ; EVAPORATION ; PARTITION ; TRANSPORT ; CUTOFFS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000286655500004
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4485
Collection太阳高能及相关物理过程研究团组
Affiliation1.Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow G12 8QQ, Lanark, Scotland
2.Max Planck Inst Solar Syst Res, D-37191 Katlenburg Lindau, Germany
3.Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Guo, Jingnan,Liu, Siming,Fletcher, Lyndsay,et al. RELATIONSHIP BETWEEN HARD AND SOFT X-RAY EMISSION COMPONENTS OF A SOLAR FLARE[J]. ASTROPHYSICAL JOURNAL,2011,728(1):4(12pp).
APA Guo, Jingnan,Liu, Siming,Fletcher, Lyndsay,&Kontar, Eduard P..(2011).RELATIONSHIP BETWEEN HARD AND SOFT X-RAY EMISSION COMPONENTS OF A SOLAR FLARE.ASTROPHYSICAL JOURNAL,728(1),4(12pp).
MLA Guo, Jingnan,et al."RELATIONSHIP BETWEEN HARD AND SOFT X-RAY EMISSION COMPONENTS OF A SOLAR FLARE".ASTROPHYSICAL JOURNAL 728.1(2011):4(12pp).
Files in This Item:
File Name/Size DocType Version Access License
2011068RELATIONSHIP (2063KB) 开放获取LicenseView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Guo, Jingnan]'s Articles
[Liu, Siming]'s Articles
[Fletcher, Lyndsay]'s Articles
Baidu academic
Similar articles in Baidu academic
[Guo, Jingnan]'s Articles
[Liu, Siming]'s Articles
[Fletcher, Lyndsay]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Guo, Jingnan]'s Articles
[Liu, Siming]'s Articles
[Fletcher, Lyndsay]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2011068RELATIONSHIP BETWEEN HARD AND SOFT X-RAY EMISSION COMPONENTS OF A SOLAR FLARE .pdf
Format: Adobe PDF
All comments (0)
No comment.
 

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