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题名: DEPENDENCE OF THE ANOMALOUS RESISTIVITY ON THE INDUCED ELECTRIC FIELD IN SOLAR FLARES
作者: Wu, Guiping1; Huang, Guangli2; Ji HaiSheng(季海生)2
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2010-09-01
卷号: 720, 期号:1, 页码:771-775
关键词: acceleration of particles ; Sun: flares ; turbulence
DOI: 10.1088/0004-637X/720/1/771
文章类型: Article
英文摘要: Anomalous resistivity is a critical parameter for triggering the fast magnetic reconnection and interpreting the eruption of solar flares in the nearly collisionless coronal plasma. However, the mechanism for the production of anomalous resistivity and its evolution are weakly understood. In this paper, the one-dimensional Vlasov equation was numerically solved with the typical solar coronal parameters and realistic mass ratio in the presence of strong inductive electric field, and the relationship between the anomalous resistivity and the reconnecting electric field was inferred for the area near the center of reconnecting current sheets. Our principal findings are summarized as follows. (1) The relationship between the anomalous resistivity and the reconnecting electric field E(0) may be represented by eta(eff) = [10.82-10.99 exp (-0.36 E(0))]Omega m. (2) If E(0) is small enough, it may be described by eta(eff) = [4.02 E(0) - 0.18]Omega m, which is basically consistent with the early experimental results on the plasma response to the applied electric field. (3) In comparison with theoretical formulas for the current-driven ion-acoustic and Buneman anomalous resistivities, if E(0) is small, the anomalous resistivity may be due to the ion-acoustic instability; if E(0) is large, the anomalous resistivity may be due to the Buneman instability. These results are also basically consistent with early experiments.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: RECONNECTING CURRENT SHEETS ; ION-ACOUSTIC RESISTIVITY ; MAGNETIC RECONNECTION ; PARTICLE-ACCELERATION ; 2-RIBBON FLARES ; PLASMA ; TURBULENCE ; SIMULATION ; EVOLUTION ; EMISSION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000281596000066
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15945
Appears in Collections:太阳活动的多波段观测研究团组_期刊论文

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作者单位: 1.Southeast Univ, Dept Phys, Nanjing 210096, Jiangsu, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
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