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FAST MAGNETIC RECONNECTION IN THE SOLAR CHROMOSPHERE MEDIATED BY THE PLASMOID INSTABILITY
Ni L(倪蕾); Bernhard Kliem; Lin J(林隽); Wu, N; Ni, L (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2015-01-20
卷号799期号:1
DOI10.1088/0004-637X/799/1/79
产权排序第1完成单位
收录类别SCI
关键词Magnetic Reconnection Magnetohydrodynamics (Mhd) Radiation: Dynamics Sun: Activity Sun: Chromosphere
摘要Magnetic reconnection in the partially ionized solar chromosphere is studied in 2.5 dimensional magnetohydrodynamic simulations including radiative cooling and ambipolar diffusion. A Harris current sheet with and without a guide field is considered. Characteristic values of the parameters in the middle chromosphere imply a high magnetic Reynolds number of similar to 10(6)-10(7) in the present simulations. Fast magnetic reconnection then develops as a consequence of the plasmoid instability without the need to invoke anomalous resistivity enhancements. Multiple levels of the instability are followed as it cascades to smaller scales, which approach the ion inertial length. The reconnection rate, normalized to the asymptotic values of magnetic field and Alfven velocity in the inflow region, reaches values in the range similar to 0.01-0.03 throughout the cascading plasmoid formation and for zero as well as for strong guide field. The outflow velocity reaches approximate to 40 km s(-1). Slow-mode shocks extend from the X-points, heating the plasmoids up to similar to 8 x 10(4) K. In the case of zero guide field, the inclusion of both ambipolar diffusion and radiative cooling causes a rapid thinning of the current sheet (down to similar to 30 m) and early formation of secondary islands. Both of these processes have very little effect on the plasmoid instability for a strong guide field. The reconnection rates, temperature enhancements, and upward outflow velocities from the vertical current sheet correspond well to their characteristic values in chromospheric jets.
项目资助者NSFY [11203069] ; Yunnan Province [2011FB113] ; key Laboratory of Solar Activity grant [KLSA201404] ; China Scholarship Council (CSC) [201404910269] ; Western Light of Chinese Academy of Sciences ; Program 973 [2011CB811403, 2013CBA01503] ; NSFC [11273055, 11333007] ; CAS [KJCX2-EW-T07, XDB09000000] ; Chinese Academy of Sciences [2012T1J0017] ; DFG
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2015-03-30
WOS记录号WOS:000348214500077
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]EJECTION CURRENT SHEETS ; PARTIALLY-IONIZED-GASES ; ELLERMAN BOMBS ; NUMERICAL SIMULATIONS ; FINE-STRUCTURE ; ANEMONE JETS ; SPECTRAL-ANALYSIS ; FLARE LOOP ; H-ALPHA ; ATMOSPHERE
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被引频次:48[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6274
专题太阳物理研究组
通讯作者Ni, L (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China.
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Ni L,Bernhard Kliem,Lin J,et al. FAST MAGNETIC RECONNECTION IN THE SOLAR CHROMOSPHERE MEDIATED BY THE PLASMOID INSTABILITY[J]. ASTROPHYSICAL JOURNAL,2015,799(1).
APA Ni L,Bernhard Kliem,Lin J,Wu, N,&Ni, L .(2015).FAST MAGNETIC RECONNECTION IN THE SOLAR CHROMOSPHERE MEDIATED BY THE PLASMOID INSTABILITY.ASTROPHYSICAL JOURNAL,799(1).
MLA Ni L,et al."FAST MAGNETIC RECONNECTION IN THE SOLAR CHROMOSPHERE MEDIATED BY THE PLASMOID INSTABILITY".ASTROPHYSICAL JOURNAL 799.1(2015).
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