FAST MAGNETIC RECONNECTION IN THE SOLAR CHROMOSPHERE MEDIATED BY THE PLASMOID INSTABILITY

	FAST MAGNETIC RECONNECTION IN THE SOLAR CHROMOSPHERE MEDIATED BY THE PLASMOID INSTABILITY
	Ni L(倪蕾); Bernhard Kliem; Lin J(林隽); Wu, N; Lin J(林隽); Ni L(倪蕾)
刊名	ASTROPHYSICAL JOURNAL
	2015-01-20
卷号	799 期号:1
关键词	magnetic reconnection magnetohydrodynamics (MHD) radiation: dynamics Sun: activity Sun: chromosphere
ISSN号	0004-637X
通讯作者	Ni, L (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	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.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	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
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-637X/799/1/79/meta
语种	英语
WOS记录号	WOS:000348214500077
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6274]
专题	云南天文台_太阳物理研究组
通讯作者	Ni L(倪蕾)
推荐引用方式 GB/T 7714	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	倪蕾,Bernhard Kliem,林隽,Wu, N,Lin J,&Ni L.(2015).FAST MAGNETIC RECONNECTION IN THE SOLAR CHROMOSPHERE MEDIATED BY THE PLASMOID INSTABILITY.ASTROPHYSICAL JOURNAL,799(1).
MLA	倪蕾,et al."FAST MAGNETIC RECONNECTION IN THE SOLAR CHROMOSPHERE MEDIATED BY THE PLASMOID INSTABILITY".ASTROPHYSICAL JOURNAL 799.1(2015).