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Charged-particle acceleration in a reconnecting current sheet including multiple magnetic islands and a nonuniform background magnetic field
Li Y(李燕)1,2,3; Wu, N.4; Lin J(林隽)1,3
Source PublicationASTRONOMY & ASTROPHYSICS
2017-09-01
Volume605Pages:1-10
DOI10.1051/0004-6361/201630026
Contribution Rank第1完成单位
Indexed BySCI ; EI
KeywordAcceleration Of Particles Magnetic Reconnection Sun: Flares
Abstract

Context. Charged particles are accelerated to high energies in solar flares. Although we know that magnetic reconnection is an efficient mechanism in generating energetic particles, the detailed role it plays in accelerating particles is still unknown. 

Aims. We investigate particle acceleration by magnetic reconnection in the current sheet, including multiple islands and a guide field. 

Methods. The long current sheet produced by the disruption in the corona magnetic field is usually not stable to various plasma instabilities, among which the tearing mode is the most important, and magnetic islands start to form in the current sheet when these instabilities develop. Two reverse processes are typically observed in the sheet: cascading of large islands to smaller ones, and merging of small islands into larger ones. Coalescent reconnection consequently takes place between two adjacent islands when merging occurs. The electric field induced by the coalescent reconnection is opposite to the electric field of the primary large-scale reconnection. We studied particle acceleration in such a current sheet and examined in detail the dynamic properties of electrons and protons in the current sheet through test particle approach. 

Results. We found that some particles can be accelerated to high energies in a very short time, and some particles (near the coalescence reconnection site) are accelerated and decelerated back and forth by the primary and secondary electric fields. Particle motions show two distinct types along different trajectories: some particles are trapped around magnetic islands, and some escape from the current sheet mainly along open field lines. With the presence of a guide field, protons and electrons are found to eventually move in different directions. The energy spectra for both species follow a double power-law shape. The softer components of the power-law spectrum are due to the particles that are trapped and circulate around magnetic islands, while the particles that escape and are partly trapped contribute to the harder component of the spectrum. Finally, we also investigated the influences of the parameters for the reconnection process on the spectral feature.

Funding ProjectProgram 973 grant[2013CBA01503] ; NSFC grant[11203069] ; NSFC grant[11273055] ; NSFC grant[11333007] ; NSFC grant[11403100] ; NSFC grant[11573064] ; CAS grant[XDB09040202] ; CAS grant[QYZDJ-SSW-SLH012] ; key Laboratory of Solar Activity grant[KLSA201409] ; NSFC-Guangdong Joint Fund (the Second Phase)[NSFC 2015-463]
Funding OrganizationProgram 973 grant[2013CBA01503] ; NSFC grant[11203069, 11273055, 11333007, 11403100, 11573064] ; CAS grant[XDB09040202, QYZDJ-SSW-SLH012] ; key Laboratory of Solar Activity grant[KLSA201409] ; NSFC-Guangdong Joint Fund (the Second Phase)[NSFC 2015-463]
Language英语
Subject Area天文学 ; 太阳与太阳系 ; 太阳物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
WOS IDWOS:000412231200107
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSOLAR-FLARES ; ELECTRON ACCELERATION ; PROTON ACCELERATION ; 2-RIBBON FLARES ; ENERGY-SPECTRA ; SITE ; COALESCENCE ; RESISTIVITY ; ORBITS ; REGION
EI Accession Number20173904209239
EI KeywordsMagnetoplasma
EI Classification Number701Electricity and Magnetism - 932.1.1Particle Accelerators - 932.3Plasma Physics
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/10168
Collection太阳物理研究组
Corresponding AuthorLi Y(李燕)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming Yunnan; 650216, China
2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing; 100012, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District Beijing; 100012, China
4.School of Tourism and Geography, Yunnan Normal University, Kunming; 650031, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li Y,Wu, N.,Lin J. Charged-particle acceleration in a reconnecting current sheet including multiple magnetic islands and a nonuniform background magnetic field[J]. ASTRONOMY & ASTROPHYSICS,2017,605:1-10.
APA Li Y,Wu, N.,&Lin J.(2017).Charged-particle acceleration in a reconnecting current sheet including multiple magnetic islands and a nonuniform background magnetic field.ASTRONOMY & ASTROPHYSICS,605,1-10.
MLA Li Y,et al."Charged-particle acceleration in a reconnecting current sheet including multiple magnetic islands and a nonuniform background magnetic field".ASTRONOMY & ASTROPHYSICS 605(2017):1-10.
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