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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
Source PublicationASTROPHYSICAL JOURNAL
2015-01-20
Volume799Issue:1
DOI10.1088/0004-637X/799/1/79
Contribution Rank第1完成单位
Indexed BySCI
KeywordMagnetic Reconnection Magnetohydrodynamics (Mhd) Radiation: Dynamics Sun: Activity Sun: Chromosphere
Abstract

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.

Funding ProjectNSFY[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] ; Program 973[2013CBA01503] ; NSFC[11273055] ; NSFC[11333007] ; CAS[KJCX2-EW-T07] ; CAS[XDB09000000] ; Chinese Academy of Sciences[2012T1J0017] ; DFG
Funding OrganizationNSFY[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
Language英语
Subject Area天文学 ; 太阳与太阳系 ; 太阳物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
Archive Date2015-03-30
WOS IDWOS:000348214500077
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordEJECTION CURRENT SHEETS ; PARTIALLY-IONIZED-GASES ; ELLERMAN BOMBS ; NUMERICAL SIMULATIONS ; FINE-STRUCTURE ; ANEMONE JETS ; SPECTRAL-ANALYSIS ; FLARE LOOP ; H-ALPHA ; ATMOSPHERE
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6274
Collection太阳物理研究组
Corresponding AuthorNi L(倪蕾)
Recommended Citation
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 Ni L,Bernhard Kliem,Lin J,&Wu, N.(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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