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初始电流片长宽比对非对称多重X线重联的影响

李灵杰

李灵杰. 初始电流片长宽比对非对称多重X线重联的影响[J]. 空间科学学报, 2022, 42(2): 225-231. doi: 10.11728/cjss2022.02.210113008
引用本文: 李灵杰. 初始电流片长宽比对非对称多重X线重联的影响[J]. 空间科学学报, 2022, 42(2): 225-231. doi: 10.11728/cjss2022.02.210113008
LI Lingjie. Effects of the Length-width Ratio of Current Sheet on Asymmetry Multiple X-line Reconnection (in Chinese). Chinese Journal of Space Science, 2022, 42(2): 225-231. DOI: 10.11728/cjss2022.02.210113008
Citation: LI Lingjie. Effects of the Length-width Ratio of Current Sheet on Asymmetry Multiple X-line Reconnection (in Chinese). Chinese Journal of Space Science, 2022, 42(2): 225-231. DOI: 10.11728/cjss2022.02.210113008

初始电流片长宽比对非对称多重X线重联的影响

doi: 10.11728/cjss2022.02.210113008
基金项目: 国家自然科学基金项目(41904146,11847032)和台州学院培育项目(2018 PY011,2018 PY009)共同资助
详细信息
    作者简介:

    李灵杰:E-mail:ljli@tzc.edu.cn

  • 中图分类号: P354

Effects of the Length-width Ratio of Current Sheet on Asymmetry Multiple X-line Reconnection

  • 摘要: 采用可压缩电阻性磁流体力学模型,研究了初始电流片的长宽比${L_x}$对非对称多重X线磁场重联的影响。研究结果发现,当${L_x}$超过一定的阈值时,非对称磁场重联的演化过程中将伴有多重X线重联发生。进一步地研究结果表明,当${L_x}$越大,多重X线重联就越容易出现,相同时间间隔内所诱发的次级磁岛的尺寸也随之相应变大,不仅如此,次级磁岛的尺寸占整个模拟尺寸的比例也有所增大。对于${L_x}$比较大的情形,当非对称多重X线磁场重联发展到一定程度后,非对称多重X线磁场重联的重联点基本不随时间变化,并且所诱发的大尺度次级磁岛的大小也基本稳定,该结论与Magnetospheric Multiscale (MMS) 观测现象一致。因此这些结果可以用来解释一些卫星观测现象,尤其对空间物理中有关次级磁重联产生的多重X重联的观测有一定指导作用。

     

  • 图  1  $ {L_x} = 24 $$ {L_x} = 30 $ 时不同时刻的电流$ {J_y} $分布

    Figure  1.  Contour of ${J_y}$ with $ {L_x} = 24 $ and $ {L_x} = 30 $

    图  2  不同$ {L_x} $条件下$t = 160$ 时电流$ {J_y} $的分布

    Figure  2.  Contour of ${J_y}$ for $t = 160$ with different $ {L_x} $

    图  3  不同$ {L_x} $条件下 $t = 300$$t = 600$ 时电流$ {J_y} $的分布

    Figure  3.  Contour of ${J_y}$ for $t = 300$ and $t = 600$ with different $ {L_x} $

    图  4  不同$ {L_x} $下多重X重联发生后$t = 600$ 时次级磁岛大小所占系统的比例

    Figure  4.  Percent of secondary island at $t = 600$ for different $ {L_x} $

    图  5  $ {L_x} = 40 $ 时不同时刻电流$ {J_y} $的分布

    Figure  5.  Distribution of ${J_y}$ of $ {L_x} = 40 $ for different times

    图  6  $ {L_x} = 40 $$t = 300$$t = 600$ 一侧重联点位置的分布(红色为 $t = 550$$t = 600$ 时刻)

    Figure  6.  Location of reconnection point for $ {L_x} = 40 $ from $t = 300$ to $t = 600$ (red for $t = 550$ to $t = 600$ )

    表  1  不同$ {L_x} $条件下多重X重联的发生情况

    Table  1.   Occurrence of multiple-X lines reconnection with different $ {{\boldsymbol{L}}_{\boldsymbol{x}}} $

    Lx24252628303240
    是否发生多重X重联
    下载: 导出CSV
  • [1] GIOVANELLI R G. A theory of chromospheric flares[J]. Nature, 1946, 158(4003): 81-82 doi: 10.1038/158081a0
    [2] PRIEST E R. The magnetohydrodynamics of current sheets[J]. Reports on Progress in Physics, 1985, 48(7): 955-1090 doi: 10.1088/0034-4885/48/7/002
    [3] GOSLING J T, THOMSEN M F, BAME S J, et al. Cold ion beams in the low latitude boundary layer during accelerated flow events[J]. Geophysical Research Letters, 1990, 17(12): 2245-2248 doi: 10.1029/GL017i012p02245
    [4] KU H C, SIBECK D G. Internal structure of flux transfer events produced by the onset of merging at a single X line[J]. Journal of Geophysical Research: Space Physics, 1997, 102(A2): 2243-2260 doi: 10.1029/96JA03162
    [5] CASSAK P A, SHAY M A. Structure of the dissipation region in fluid simulations of asymmetric magnetic reconnection[J]. Physics of Plasmas, 2009, 16(5): 055704 doi: 10.1063/1.3086867
    [6] WANG R S, NAKAMURA R, LU Q M, et al. Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection[J]. Journal of Geophysical Research: Space Physics, 2012, 117(A7): A07223
    [7] LIU Z Q, LU J Y, WANG C, et al. A three-dimensional high Mach number asymmetric magnetopause model from global MHD simulation[J]. Journal of Geophysical Research: Space Physics, 2015, 120(7): 5645-5666 doi: 10.1002/2014JA020961
    [8] DOSS C E, KOMAR C M, CASSAK P A, et al. Asymmetric magnetic reconnection with a flow shear and applications to the magnetopause[J]. Journal of Geophysical Research: Space Physics, 2015, 120(9): 7748-7763 doi: 10.1002/2015JA021489
    [9] BOROVSKY J E, HESSE M. The reconnection of magnetic fields between plasmas with different densities: scaling relations[J]. Physics of Plasmas, 2007, 14(10): 102309 doi: 10.1063/1.2772619
    [10] CASSAK P A, SHAY M A. Scaling of asymmetric magnetic reconnection: General theory and collisional simulations[J]. Physics of Plasmas, 2007, 14(10): 102114 doi: 10.1063/1.2795630
    [11] BIRN J, BOROVSKY J E, HESSE M, et al. Scaling of asymmetric reconnection in compressible plasmas[J]. Physics of Plasmas, 2010, 17(5): 052108 doi: 10.1063/1.3429676
    [12] WANG L, WANG X G, WANG X Q, et al. Asymmetric magnetic reconnection with out-of-plane shear flows in a two dimensional hybrid model[J]. Physics of Plasmas, 2015, 22(5): 052110 doi: 10.1063/1.4919965
    [13] TRATTNER K J, MULCOCK J S, PETRINEC S M, et al. Location of the reconnection line at the magnetopause during southward IMF conditions[J]. Geophysical Research Letters, 2007, 34(3): L03108
    [14] VINES S K, FUSELIER S A, PETRINEC S M, et al. Occurrence frequency and location of magnetic islands at the dayside magnetopause[J]. Journal of Geophysical Research: Space Physics, 2017, 122(4): 4138-4155 doi: 10.1002/2016JA023524
    [15] FUSELIER S A, PETRINEC S M, TRATTNER K J, et al. Observational evidence of large-scale multiple reconnection at the Earth’s dayside magnetopause[J]. Journal of Geophysical Research: Space Physics, 2018, 123(10): 8407-8421 doi: 10.1029/2018JA025681
    [16] LEE L C, FU Z F. Multiple X line reconnection: 1. A criterion for the transition from a single X line to a multiple X line reconnection[J]. Journal of Geophysical Research: Space Physics, 1986, 91(A6): 6807-6815 doi: 10.1029/JA091iA06p06807
    [17] MA Z W, WANG L C, LI L J. Reconnection dynamics with secondary tearing instability in compressible Hall plasmas[J]. Physics of Plasmas, 2015, 22(6): 062104 doi: 10.1063/1.4922057
    [18] DAI L. Structures of Hall fields in asymmetric magnetic reconnection[J]. Journal of Geophysical Research: Space Physics, 2018, 123(9): 7332-7341 doi: 10.1029/2018JA025251
    [19] LI L J, ZHANG X, WANG L C, et al. Slow shock formation and structure with sub-Alfvénic shear flow in magnetic reconnection[J]. Journal of Geophysical Research: Space Physics, 2012, 117(A6): A06207
    [20] ZHANG X, LI L J, WANG L C, et al. Influences of sub-Alfvénic shear flows on nonlinear evolution of magnetic reconnection in compressible plasmas[J]. Physics of Plasmas, 2011, 18(9): 092112 doi: 10.1063/1.3643792
    [21] MA Z W, BHATTACHARJEE A. Hall magnetohydrodynamic reconnection: the Geospace environment modeling challenge[J]. Journal of Geophysical Research: Space Physics, 2001, 106(A3): 3773-3782 doi: 10.1029/1999JA001004
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出版历程
  • 收稿日期:  2021-01-13
  • 录用日期:  2021-04-29
  • 修回日期:  2021-09-28
  • 网络出版日期:  2022-04-11

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