Evolutions of Asymmetric Multiple-X Lines Reconnection with Influences of Guiding Field

doi:10.19596/j.cnki.1001-246x.8627

Abstract

Abstract:

Influences of guiding field on asymmetry multiple-X lines reconnection are investigated using two-dimensional compressible resistive MHD models. It is found that the external guiding field B_y0 can promote multiple-X lines reconnection occur during the asymmetry reconnection processes for the case of multiple-X lines reconnection occur without the guidance field. Multiple-X lines reconnection occurs faster as B_y0 becomes larger. For the case that there is no multiple-X lines reconnection appeared without a guiding field, the secondary magnetic island will be induced when including a certain guiding field. Further study found that multiple-X lines reconnection could not be induced when the guiding field becomes large enough. Both cases show that the guiding field can promote or induce the occurrence of the multiple-X lines reconnection, and there is a threshold value. When B_y0 exceeded the threshold value, the promoting or inducing effect becomes weak. The results here can be useful for understanding some observed data, even for the multiple-X lines reconnection observations.

Key words: magnetic reconnection, guiding field, magneto hydro dynamic, secondary island

Lingjie LI. Evolutions of Asymmetric Multiple-X Lines Reconnection with Influences of Guiding Field[J]. Chinese Journal of Computational Physics, 2023, 40(4): 436-442.

Figures/Tables 7

Fig.1 Distribution of current density Jy at different time with Lx=26 for By0 (a) and (b)By0=0;(c) and (d)By0=0.5;(e) and (f)By0=2.0

Fig.2 Onset time of secondary island for Lx=26 with By0

Fig.3 Distribution of current density Jy for t=500 at By0 with Lx=25 (a)By0=0.5, (b)By0=1.0, (c)By0=1.5, (d)By0=2.0

Table 1 Situation of multiple-X lines reconnection with different By0

B_y0	0	0.5	1.0	1.2	1.5	1.8	2.0	2.5	3.0
多重X线重联	否	否	否	是	是	是	是	否	否

Fig.4 Onset time of secondary island for Lx=25 with By0

Fig.5 Evolution of current density Jy for By0=3.0 at different time (a)t=100; (b) t=300; (c) t=500; (d)t=600

Fig.6 Evolution of current density Jy with different Lx for By0=2.0 at t=200 (a) Lx=20; (b) Lx=25; (c) Lx=30

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