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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
发表期刊ASTROPHYSICAL JOURNAL
卷号815期号:1页码:6-22
摘要We 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.
文章类型Article
关键词Acceleration Of Particles Magnetic Reconnection Magnetohydrodynamics (Mhd) Methods: Numerical Plasmas Sun: Flares
WOS标题词Science & Technology ; Physical Sciences
学科领域天体物理学
DOI10.1088/0004-637X/815/1/6
关键词[WOS]UNDERSTANDING PARTICLE-ACCELERATION ; EJECTION CURRENT SHEET ; X-RAY-EMISSION ; ENERGY-SPECTRA ; FIELD RECONNECTION ; FLARES ; LOOP ; FRAGMENTATION ; TRAP ; MODEL
收录类别SCI
语种英语
项目资助者German-Chinese center of collaboration by the Max-Planck Institute for Solar System Research ; Max-Planck-Princeton Center for Plasma Physics ; MSTC(2011CB811402) ; Strategic Priority Research Program ; Emergence of Cosmological Structures, of the Chinese Academy of Sciences(XDB09000000) ; NNSFC(11233008 ; 11173064 ; 11427803)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000367105000006
引用统计
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/15213
专题太阳高能及相关物理过程研究团组
作者单位1.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
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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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