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The effect of Compton scattering on gamma-ray spectra of the 2005 January 20 flare
Chen, Wei; Gan, Wei-Qun
2012-10-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume12Issue:10Pages:1439-1450
AbstractGamma-ray spectroscopy provides a wealth of information about accelerated particles in solar flares, as well as the ambient medium with which these energetic particles interact. The neutron capture line (2.223 MeV), the strongest in the solar gamma-ray spectrum, forms in the deep atmosphere. The energy of these photons can be reduced via Compton scattering. With the fully relativistic GEANT4 toolkit, we have carried out Monte Carlo simulations of the transport of a neutron capture line in solar flares, and applied them to the flare that occurred on 2005 January 20 (X7.1/2B), one of the most powerful gamma-ray flares observed by RHESSI during the 23rd solar cycle. By comparing the fitting results of different models with and without Compton scattering of the neutron capture line, we find that when including the Compton scattering for the neutron capture line, the observed gamma-ray spectrum can be reproduced by a population of accelerated particles with a very hard spectrum (s <= 2.3). The Compton effect of a 2.223 MeV line on the spectra is therefore proven to be significant, which influences the time evolution of the neutron capture line flux as well. The study also suggests that the mean vertical depth for neutron capture in hydrogen for this event is about 8 g cm(-2).
KeywordSun: Flares Sun: Gamma-rays Scattering: Compton Scattering
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordNEUTRON-CAPTURE LINE ; SOLAR-FLARES ; ENERGETIC PARTICLE ; CORONAL ABUNDANCES ; DEEXCITATION LINES ; 28 OCTOBER ; X-RAYS ; EMISSION ; RHESSI ; DISTRIBUTIONS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000310476800006
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8042
Collection太阳高能及相关物理过程研究团组
AffiliationChinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Chen, Wei,Gan, Wei-Qun. The effect of Compton scattering on gamma-ray spectra of the 2005 January 20 flare[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2012,12(10):1439-1450.
APA Chen, Wei,&Gan, Wei-Qun.(2012).The effect of Compton scattering on gamma-ray spectra of the 2005 January 20 flare.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,12(10),1439-1450.
MLA Chen, Wei,et al."The effect of Compton scattering on gamma-ray spectra of the 2005 January 20 flare".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12.10(2012):1439-1450.
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