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ELECTRON ACCELERATION BY CASCADING RECONNECTION IN THE SOLAR CORONA. I. MAGNETIC GRADIENT AND CURVATURE DRIFT EFFECTS
Zhou, X.1,2; Buechner, J.1; Barta, M.1,3; Gan, W.2; Liu, S.2
2015-12-10
Source PublicationASTROPHYSICAL JOURNAL
Volume815Issue:1Pages:6-22
AbstractWe investigate the electron acceleration by magnetic gradient and curvature drift effects in cascading magnetic reconnection of a coronal current sheet via a test particle method in the framework of the guiding center approximation. After several Alfven transit times, most of the electrons injected at the current sheet are still trapped in the magnetic islands. A small fraction of the injected electrons precipitate into the chromosphere. The acceleration of trapped electrons is dominated by the magnetic curvature drifts, which change the parallel momentum of the electron, and appears to be more efficient than the acceleration of precipitating electrons, which is dominated by the perpendicular momentum change caused by the magnetic gradient drifts. With the resulting trapped energetic electron distribution, the corresponding hard X-ray (HXR) radiation spectra are calculated using an optically thin Bremsstrahlung model. Trapped electrons may explain flare loop. top HXR emission. as well as the observed bright spots along. current sheets trailing coronal mass ejections. The asymmetry of precipitating electrons with respect to the polarity inversion line may contribute to the observed asymmetry of footpoint emission.
KeywordAcceleration Of Particles Magnetic Reconnection Magnetohydrodynamics (Mhd) Methods: Numerical Plasmas Sun: Flares
Subject Area天体物理学
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/815/1/6
WOS KeywordUNDERSTANDING PARTICLE-ACCELERATION ; EJECTION CURRENT SHEET ; X-RAY-EMISSION ; ENERGY-SPECTRA ; FIELD RECONNECTION ; FLARES ; LOOP ; FRAGMENTATION ; TRAP ; MODEL
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000367105000006
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15213
Collection太阳高能及相关物理过程研究团组
Affiliation1.Max Planck Inst Solar Syst Res, D-37077 Gottingen, Germany
2.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Acad Sci Czech Republic, Astron Inst, Ondrejov, Czech Republic
Recommended Citation
GB/T 7714
Zhou, X.,Buechner, J.,Barta, M.,et al. ELECTRON ACCELERATION BY CASCADING RECONNECTION IN THE SOLAR CORONA. I. MAGNETIC GRADIENT AND CURVATURE DRIFT EFFECTS[J]. ASTROPHYSICAL JOURNAL,2015,815(1):6-22.
APA Zhou, X.,Buechner, J.,Barta, M.,Gan, W.,&Liu, S..(2015).ELECTRON ACCELERATION BY CASCADING RECONNECTION IN THE SOLAR CORONA. I. MAGNETIC GRADIENT AND CURVATURE DRIFT EFFECTS.ASTROPHYSICAL JOURNAL,815(1),6-22.
MLA Zhou, X.,et al."ELECTRON ACCELERATION BY CASCADING RECONNECTION IN THE SOLAR CORONA. I. MAGNETIC GRADIENT AND CURVATURE DRIFT EFFECTS".ASTROPHYSICAL JOURNAL 815.1(2015):6-22.
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