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题名: ELECTRON ACCELERATION BY CASCADING RECONNECTION IN THE SOLAR CORONA. I. MAGNETIC GRADIENT AND CURVATURE DRIFT EFFECTS
作者: Zhou Xin(周鑫)1, 2; Buechner, J.1; Barta, M.1, 3; Gan, W.2; Liu, S.2
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015-12-10
卷号: 815, 期号:1, 页码:6-22
关键词: acceleration of particles ; magnetic reconnection ; magnetohydrodynamics (MHD) ; methods: numerical ; plasmas ; Sun: flares
学科分类: 天体物理学
DOI: 10.1088/0004-637X/815/1/6
文章类型: Article
英文摘要: 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
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
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)
语种: 英语
WOS记录号: WOS:000367105000006
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15213
Appears in Collections:太阳高能及相关物理过程研究团组_期刊论文

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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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